title: Cannot Build gem for Ruby on Rails
body: <p>I cannot build a Ruby gem for some reason. I'm new to Ruby so not really sure what exactly is happening.</p>
  <h3>This is the output:</h3>
  <pre><code>$ bundle exec rake release
  
  rake aborted!
  /Users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/psych/deprecated.rb:19:in `block in quick_emit': stack level too deep (SystemStackError)
      from /Users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/specification.rb:2286:in `block (2 levels) in to_yaml'
      from /Users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/psych/coder.rb:36:in `map'
      from /Users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/specification.rb:2285:in `block in to_yaml'
      from /Users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/psych/deprecated.rb:19:in `call'
      from /Users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/psych/deprecated.rb:19:in `block in quick_emit'
      from /Users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/specification.rb:2286:in `block (2 levels) in to_yaml'
      from /Users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/2.2.0/psych/coder.rb:36:in `map'
      from /Users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/specification.rb:2285:in `block in to_yaml'
       ... 9618 levels...
      from /Users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/command_manager.rb:170:in `process_args'
      from /Users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/command_manager.rb:130:in `run'
      from /Users/kev/.rvm/rubies/ruby-2.2.0/lib/ruby/site_ruby/2.2.0/rubygems/gem_runner.rb:60:in `run'
      from /Users/kev/.rvm/rubies/ruby-2.2.0/bin/gem:21:in `&lt;main&gt;'
  /Users/kev/.rvm/gems/ruby-2.2.0/gems/bundler-1.9.2/lib/bundler/gem_helper.rb:155:in `sh'
  /Users/kev/.rvm/gems/ruby-2.2.0/gems/bundler-1.9.2/lib/bundler/gem_helper.rb:70:in `build_gem'
  /Users/kev/.rvm/gems/ruby-2.2.0/gems/bundler-1.9.2/lib/bundler/gem_helper.rb:39:in `block in install'
  /Users/kev/.rvm/gems/ruby-2.2.0/bin/ruby_executable_hooks:15:in `eval'
  /Users/kev/.rvm/gems/ruby-2.2.0/bin/ruby_executable_hooks:15:in `&lt;main&gt;'
  Tasks: TOP =&gt; release =&gt; build
  (See full trace by running task with --trace)
  </code></pre>