Document config/editor.json
Merge branch 'master' of github.com:tpope/vim-rails

* 'master' of github.com:tpope/vim-rails:
  Fix :Rcontroller from view with no argument
  Deprecate :Rplugin for Gemfile access
  Assorted navigation command fixes
  Fix creating files to respect working directory
  Fix accidental references to global app
  Fix defaults for :Rmodel et al
  Fix :Rtask
  Allow appending to path in editor.json
  Update 'path' to match Rails 4
  Don't reveal ../ in navcommand defaults
  Fix :Rmailer
  Implement new file finder backend
  Restructure navcommands to support execution
  Switch :Rlib default to Gemfile
  End the paranoia
  Don't require trailing / in :Rnavcommand directory
  Fix editor.json error when not in app root
  Respect 'modelines' for rails.vim modelines