Improve readable_alternate_candidates for js files

Map between app/assets/javascripts and spec/javascripts so :AV works
properly with javascript specs.

Adapted from @rupurt's patch on an older version of this plugin -
https://github.com/Casecommons/vim-rails/commit/0f6fbd624c2d8c1310d2a79914ad854d9c747e7b
Merge pull request #290 from DanielleSucher/javascript_readable_alternate_candidates

Improve readable_alternate_candidates for js files
Support of gf command for jbuilder partials.
Merge pull request #294 from dimonzozo/jbuilder_partial

Support of gf command for jbuilder partials.
Don't let css.vim clobber 'iskeyword'

Closes #284.
Remove deprecated :UltiSnipsAddFiletypes call

Closes #295.
Tighten down legacy ActionWebService match

Probably pretty safe to retire this entirely, at some point.

Closes #296.
Fix docs regarding :Rake and bundler.vim
Fix detection of quoted default locale

Closes #298.
Support change_column_null

Add syntax highlighting on `change_column_null` method in migration
files. You can get further detail on it from the API reference:

http://api.rubyonrails.org/classes/ActiveRecord/ConnectionAdapters/SchemaStatements.html#method-i-change_column_null
Merge pull request #301 from a2ikm/support_change_column_null

Support change_column_null
Fix alternate of test/lib files

Closes #303.
Support app/assets file creation

Closes #304.
Fix old editor.json reference
Create sass files if specified as preferred syntax

References #304.
Simplify check for stylesheet extension
This FAQ was obsoleted by :Rrunner
Add a note about indenting

Closes #244.
Use regex to avoid issues with reserved class names

Closes #261.
Fix error on editing yaml and erb files

References 261.