Run rake task

This shortcut is listed in
http://www.jetbrains.com/ruby/docs/RubyMine_ReferenceCard_Mac.pdf but it
was not available.
'Ruby/Rails' quick list

This shortcut is listed in
http://www.jetbrains.com/ruby/docs/RubyMine_ReferenceCard_Mac.pdf but it
was not available.
Merge pull request #2 from jcpivotallabs/master

Two Rails shortcuts that are in the docs but weren't in the keymap