Updated the boilerplate gemspec.

* Uses "stabby lambdas".
* Exclude the `test_files` (or `spec/{**/}*`) from the gem's `files`.

Author: postmodern

digest-crc.gemspec

@@ -22,10 +22,14 @@ Gem::Specification.new do |gem|
   gem.homepage    = gemspec['homepage']
   gem.metadata    = gemspec['metadata'] if gemspec['metadata']
 
-  glob = lambda { |patterns| gem.files & Dir[*patterns] }
+  glob = ->(patterns) { gem.files & Dir[*patterns] }
 
-  gem.files = `git ls-files`.split($/).grep_v(/^spec\//)
-  gem.files = glob[gemspec['files']] if gemspec['files']
+  gem.files = if gemspec['files'] then glob[gemspec['files']]
+              else                     `git ls-files`.split($/)
+              end
+
+  # exclude test files from the packages gem
+  gem.files -= glob[gemspec['test_files'] || 'spec/{**/}*']
 
   gem.executables = gemspec.fetch('executables') do
     glob['bin/*'].map { |path| File.basename(path) }
@@ -45,7 +49,7 @@ Gem::Specification.new do |gem|
   gem.required_rubygems_version = gemspec['required_rubygems_version']
   gem.post_install_message      = gemspec['post_install_message']
 
-  split = lambda { |string| string.split(/,\s*/) }
+  split = ->(string) { string.split(/,\s*/) }
 
   if gemspec['dependencies']
     gemspec['dependencies'].each do |name,versions|