Squashed 'bundle/vim-rails/' changes from 39af565..9d6b78e

9d6b78e Fix tab completion for :Rails
0485ff1 Fix :Rtags
c0317b5 Invert meaning of projection internal "force"
6d0d7a3 Only short circuit creation of global projections
c08bb34 Warn about invalid use of g:rails_abbreviations
f050de8 Disambiguate help tag
a41557d Clarify when navigation commands are created
b43362f Fix abbreviations error
5a21d4d Fully document projections
f3ad023 Move default config docs next to editor.json docs
e776097 Roll g:rails_abbreviations into plugin
4a42e8e Provide g:rails_projections
c277242 Add a little breathing room
cec55ca Rewrite explanation of global settings
87afbc5 Support path_additions globally
0c994c6 Allow g:rails_ctags_arguments to be an array
1da5039 Don't need to create tmp anymore
60503a4 Mention :Rset root_url under :Rserver
8a1309b Don't create projection commands if all directories missing
cb4365b Better error message on missing projection default
34d805d Allow projections to be a list
8acbfb0 Update helper highlighting for Rails 4
72a9d9f Warn about deprecation of :Rset
f664e73 Return a single alternate from buffer.alternate()
1ffb17a Remove :Rtree
002e34b Tweak regex
f8d9412 Fix :A from controller to functional test
a6e36e9 Fix tab completion on :E commands
06a9bd8 Put tags in application root, not tmp
aa8c3ad Fix parameter
c161de0 Restore related() for backwards compatibility
6286d78 Fix . argument to navigation commands
c6bad20 Provide has_path() to replace has_file()
6ba1213 Remove gratuitous coupling to bundler.vim
adca11d Adding 'refute' assertion keywords
786e73f Add 'it_behaves_like' to RSpec keyword matches

git-subtree-dir: bundle/vim-rails
git-subtree-split: 9d6b78ee0478f9019ee7b4af02896f7a9049db06
Merge commit '9244b3f5a5180bf1b8a8c096f0588478de8f8d31'