Add dev task to install gems required for release task

Author: bootstraponline

Rakefile

@@ -46,6 +46,12 @@ task :bump do
   bump
 end
 
+desc 'Install gems required for release task'
+task :dev do
+  sh 'gem install --no-rdoc --no-ri yard'
+  sh 'gem install --no-rdoc --no-ri redcarpet'
+end
+
 # Inspired by Gollum's Rakefile
 desc 'Build and release a new gem to rubygems.org'
 task :release => :gem do
@@ -148,4 +154,4 @@ task :notes do
   end
 
   File.open('release_notes.md', 'w') { |f| f.write notes.to_s.strip }
-end
+end