Fixed potential JSON injection by using #to_json.
Always dump Strings, never try quoting them.
Use public_send over send.
Moved erb.png into doc/
Add model helpers to fetch reverse dependency gems

These helpers provide a way to collect versions or rubygems which depend
on a specific rubygem. They can be used to query the database for all the
gems which contain a given dependency.
Reuse a helper method to dry the code
Add 'reverse_dependencies' controller action
Provide tests for reverse_dependencies model helpers
Add full_name field to the reverse_dependencies payload
Add reverse_dependencies action for rubygems, shorter output version
Update multi_json dependency to version 1.7.1
Update nokogiri dependency to version 1.5.7
Update timecop dependency to version 0.6.1
Update bluepill dependency to version 0.0.61
Update bluepill dependency to version 0.0.62
Update excon dependency to version 0.20.1
Update shoulda dependency to version 3.4.0
Update nokogiri dependency to version 1.5.8
Update shoulda-matchers dependency to version 1.5.2
Update ffi dependency to version 1.5.0