diff --git a/Gemfile b/Gemfile
index 208f64aac..91d495efc 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,18 +2,23 @@ source "https://rubygems.org"
 
 git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
 
-gem 'bundler',  '~> 1.16'
-gem 'rake',     '~> 10.0'
-gem 'minitest', '~> 5.0'
+# test
+gem 'rake'
+gem 'minitest'
 gem 'rack'
 gem 'i18n'
-gem 'slim'
-gem 'haml'
-gem 'benchmark-ips'
-gem 'kalibera'
-gem 'memory_profiler'
-gem 'rubocop', '~> 0.55.0' # needs to be fixed since it constantly adds new cops
-gem 'single_cov'
+gem 'single_cov', '~> 1.3' unless ENV['SKIP_SINGLECOV']
+# include minor since it constantly adds new cops
+gem 'rubocop', '~> 0.63.1' unless ENV['SKIP_RUBOCOP']
 
+# development
+# gem 'slim'
+# gem 'haml'
 
-gem "github-pages", group: :jekyll_plugins
+# benchmark/profiling
+# gem 'benchmark-ips'
+# gem 'kalibera'
+# gem 'memory_profiler'
+
+# docs server
+#gem "github-pages", '193', group: :jekyll_plugins
diff --git a/Gemfile.lock b/Gemfile.lock
index 3904ac76c..af85f1e50 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,294 +1,40 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (4.2.9)
-      i18n (~> 0.7)
-      minitest (~> 5.1)
-      thread_safe (~> 0.3, >= 0.3.4)
-      tzinfo (~> 1.1)
-    addressable (2.5.2)
-      public_suffix (>= 2.0.2, < 4.0)
     ast (2.4.0)
-    benchmark-ips (2.7.2)
-    coffee-script (2.4.1)
-      coffee-script-source
-      execjs
-    coffee-script-source (1.11.1)
-    colorator (1.1.0)
-    commonmarker (0.17.9)
-      ruby-enum (~> 0.5)
-    concurrent-ruby (1.0.5)
-    em-websocket (0.5.1)
-      eventmachine (>= 0.12.9)
-      http_parser.rb (~> 0.6.0)
-    ethon (0.11.0)
-      ffi (>= 1.3.0)
-    eventmachine (1.2.5)
-    execjs (2.7.0)
-    faraday (0.14.0)
-      multipart-post (>= 1.2, < 3)
-    ffi (1.9.23)
-    forwardable-extended (2.6.0)
-    gemoji (3.0.0)
-    github-pages (181)
-      activesupport (= 4.2.9)
-      github-pages-health-check (= 1.4.0)
-      jekyll (= 3.7.3)
-      jekyll-avatar (= 0.5.0)
-      jekyll-coffeescript (= 1.1.1)
-      jekyll-commonmark-ghpages (= 0.1.5)
-      jekyll-default-layout (= 0.1.4)
-      jekyll-feed (= 0.9.3)
-      jekyll-gist (= 1.5.0)
-      jekyll-github-metadata (= 2.9.4)
-      jekyll-mentions (= 1.3.0)
-      jekyll-optional-front-matter (= 0.3.0)
-      jekyll-paginate (= 1.1.0)
-      jekyll-readme-index (= 0.2.0)
-      jekyll-redirect-from (= 0.13.0)
-      jekyll-relative-links (= 0.5.3)
-      jekyll-remote-theme (= 0.2.3)
-      jekyll-sass-converter (= 1.5.2)
-      jekyll-seo-tag (= 2.4.0)
-      jekyll-sitemap (= 1.2.0)
-      jekyll-swiss (= 0.4.0)
-      jekyll-theme-architect (= 0.1.1)
-      jekyll-theme-cayman (= 0.1.1)
-      jekyll-theme-dinky (= 0.1.1)
-      jekyll-theme-hacker (= 0.1.1)
-      jekyll-theme-leap-day (= 0.1.1)
-      jekyll-theme-merlot (= 0.1.1)
-      jekyll-theme-midnight (= 0.1.1)
-      jekyll-theme-minimal (= 0.1.1)
-      jekyll-theme-modernist (= 0.1.1)
-      jekyll-theme-primer (= 0.5.3)
-      jekyll-theme-slate (= 0.1.1)
-      jekyll-theme-tactile (= 0.1.1)
-      jekyll-theme-time-machine (= 0.1.1)
-      jekyll-titles-from-headings (= 0.5.1)
-      jemoji (= 0.9.0)
-      kramdown (= 1.16.2)
-      liquid (= 4.0.0)
-      listen (= 3.1.5)
-      mercenary (~> 0.3)
-      minima (= 2.4.0)
-      nokogiri (>= 1.8.1, < 2.0)
-      rouge (= 2.2.1)
-      terminal-table (~> 1.4)
-    github-pages-health-check (1.4.0)
-      addressable (~> 2.3)
-      net-dns (~> 0.8)
-      octokit (~> 4.0)
-      public_suffix (~> 2.0)
-      typhoeus (~> 1.3)
-    haml (5.0.4)
-      temple (>= 0.8.0)
-      tilt
-    html-pipeline (2.7.1)
-      activesupport (>= 2)
-      nokogiri (>= 1.4)
-    http_parser.rb (0.6.0)
-    i18n (0.9.5)
-      concurrent-ruby (~> 1.0)
-    jekyll (3.7.3)
-      addressable (~> 2.4)
-      colorator (~> 1.0)
-      em-websocket (~> 0.5)
-      i18n (~> 0.7)
-      jekyll-sass-converter (~> 1.0)
-      jekyll-watch (~> 2.0)
-      kramdown (~> 1.14)
-      liquid (~> 4.0)
-      mercenary (~> 0.3.3)
-      pathutil (~> 0.9)
-      rouge (>= 1.7, < 4)
-      safe_yaml (~> 1.0)
-    jekyll-avatar (0.5.0)
-      jekyll (~> 3.0)
-    jekyll-coffeescript (1.1.1)
-      coffee-script (~> 2.2)
-      coffee-script-source (~> 1.11.1)
-    jekyll-commonmark (1.2.0)
-      commonmarker (~> 0.14)
-      jekyll (>= 3.0, < 4.0)
-    jekyll-commonmark-ghpages (0.1.5)
-      commonmarker (~> 0.17.6)
-      jekyll-commonmark (~> 1)
-      rouge (~> 2)
-    jekyll-default-layout (0.1.4)
-      jekyll (~> 3.0)
-    jekyll-feed (0.9.3)
-      jekyll (~> 3.3)
-    jekyll-gist (1.5.0)
-      octokit (~> 4.2)
-    jekyll-github-metadata (2.9.4)
-      jekyll (~> 3.1)
-      octokit (~> 4.0, != 4.4.0)
-    jekyll-mentions (1.3.0)
-      activesupport (~> 4.0)
-      html-pipeline (~> 2.3)
-      jekyll (~> 3.0)
-    jekyll-optional-front-matter (0.3.0)
-      jekyll (~> 3.0)
-    jekyll-paginate (1.1.0)
-    jekyll-readme-index (0.2.0)
-      jekyll (~> 3.0)
-    jekyll-redirect-from (0.13.0)
-      jekyll (~> 3.3)
-    jekyll-relative-links (0.5.3)
-      jekyll (~> 3.3)
-    jekyll-remote-theme (0.2.3)
-      jekyll (~> 3.5)
-      rubyzip (>= 1.2.1, < 3.0)
-      typhoeus (>= 0.7, < 2.0)
-    jekyll-sass-converter (1.5.2)
-      sass (~> 3.4)
-    jekyll-seo-tag (2.4.0)
-      jekyll (~> 3.3)
-    jekyll-sitemap (1.2.0)
-      jekyll (~> 3.3)
-    jekyll-swiss (0.4.0)
-    jekyll-theme-architect (0.1.1)
-      jekyll (~> 3.5)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-cayman (0.1.1)
-      jekyll (~> 3.5)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-dinky (0.1.1)
-      jekyll (~> 3.5)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-hacker (0.1.1)
-      jekyll (~> 3.5)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-leap-day (0.1.1)
-      jekyll (~> 3.5)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-merlot (0.1.1)
-      jekyll (~> 3.5)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-midnight (0.1.1)
-      jekyll (~> 3.5)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-minimal (0.1.1)
-      jekyll (~> 3.5)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-modernist (0.1.1)
-      jekyll (~> 3.5)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-primer (0.5.3)
-      jekyll (~> 3.5)
-      jekyll-github-metadata (~> 2.9)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-slate (0.1.1)
-      jekyll (~> 3.5)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-tactile (0.1.1)
-      jekyll (~> 3.5)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-theme-time-machine (0.1.1)
-      jekyll (~> 3.5)
-      jekyll-seo-tag (~> 2.0)
-    jekyll-titles-from-headings (0.5.1)
-      jekyll (~> 3.3)
-    jekyll-watch (2.0.0)
-      listen (~> 3.0)
-    jemoji (0.9.0)
-      activesupport (~> 4.0, >= 4.2.9)
-      gemoji (~> 3.0)
-      html-pipeline (~> 2.2)
-      jekyll (~> 3.0)
-    kalibera (0.1)
-      memoist (~> 0.11.0)
-      rbzip2 (~> 0.2.0)
-    kramdown (1.16.2)
-    liquid (4.0.0)
-    listen (3.1.5)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
-      ruby_dep (~> 1.2)
-    memoist (0.11.0)
-    memory_profiler (0.9.8)
-    mercenary (0.3.6)
-    mini_portile2 (2.3.0)
-    minima (2.4.0)
-      jekyll (~> 3.5)
-      jekyll-feed (~> 0.9)
-      jekyll-seo-tag (~> 2.1)
+    i18n (0.8.5)
+    jaro_winkler (1.5.2)
     minitest (5.11.3)
-    multipart-post (2.0.0)
-    net-dns (0.8.0)
-    nokogiri (1.8.2)
-      mini_portile2 (~> 2.3.0)
-    octokit (4.8.0)
-      sawyer (~> 0.8.0, >= 0.5.3)
-    parallel (1.12.1)
-    parser (2.5.1.0)
+    parallel (1.13.0)
+    parser (2.6.0.0)
       ast (~> 2.4.0)
-    pathutil (0.16.1)
-      forwardable-extended (~> 2.6)
-    powerpack (0.1.1)
-    public_suffix (2.0.5)
-    rack (2.0.5)
+    powerpack (0.1.2)
+    rack (1.6.11)
     rainbow (3.0.0)
     rake (10.5.0)
-    rb-fsevent (0.10.3)
-    rb-inotify (0.9.10)
-      ffi (>= 0.5.0, < 2)
-    rbzip2 (0.2.0)
-    rouge (2.2.1)
-    rubocop (0.55.0)
+    rubocop (0.63.1)
+      jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
-      parser (>= 2.5)
+      parser (>= 2.5, != 2.5.1.1)
       powerpack (~> 0.1)
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (~> 1.0, >= 1.0.1)
-    ruby-enum (0.7.2)
-      i18n
-    ruby-progressbar (1.9.0)
-    ruby_dep (1.5.0)
-    rubyzip (1.2.1)
-    safe_yaml (1.0.4)
-    sass (3.5.6)
-      sass-listen (~> 4.0.0)
-    sass-listen (4.0.0)
-      rb-fsevent (~> 0.9, >= 0.9.4)
-      rb-inotify (~> 0.9, >= 0.9.7)
-    sawyer (0.8.1)
-      addressable (>= 2.3.5, < 2.6)
-      faraday (~> 0.8, < 1.0)
-    single_cov (1.0.3)
-    slim (3.0.9)
-      temple (>= 0.7.6, < 0.9)
-      tilt (>= 1.3.3, < 2.1)
-    temple (0.8.0)
-    terminal-table (1.8.0)
-      unicode-display_width (~> 1.1, >= 1.1.1)
-    thread_safe (0.3.6)
-    tilt (2.0.8)
-    typhoeus (1.3.0)
-      ethon (>= 0.9.0)
-    tzinfo (1.2.5)
-      thread_safe (~> 0.1)
-    unicode-display_width (1.3.0)
+      unicode-display_width (~> 1.4.0)
+    ruby-progressbar (1.10.0)
+    single_cov (1.3.0)
+    unicode-display_width (1.4.1)
 
 PLATFORMS
+  java
   ruby
 
 DEPENDENCIES
-  benchmark-ips
-  bundler (~> 1.16)
-  github-pages
-  haml
   i18n
-  kalibera
-  memory_profiler
-  minitest (~> 5.0)
+  minitest
   rack
-  rake (~> 10.0)
-  rubocop (~> 0.55.0)
-  single_cov
-  slim
+  rake
+  rubocop (~> 0.63.1)
+  single_cov (~> 1.3)
 
 BUNDLED WITH
-   1.16.1
+   1.16.6