Add autocompletion for Rails3.

+ Originally published by Christopher Chow.
+ Source:
https://github.com/robbyrussell/oh-my-zsh/blob/30620d463850c17f86e7a56fbf6a8b5e793a4e07/plugins/rails3/_rails3
  Commit: 30620d463850c17f86e7a56fbf6a8b5e793a4e07
Change duplicated alias name
rvm plugin: update to ruby version helpers and rvm-update

* the current patch levels hard-coded here are pretty dated. I updated the ruby version helpers to use loose ruby version matchers so they don't continually need to be updated with every new patch level release.

* `rvm get head` actually performs an `rvm reload` in the post install. there's no need to do again here in rvm-update so I've removed that.
The current version of bower is completely unavailable, plugin depth modification
Update coffee completion
Merge pull request #1917 from brandonblack/rvm-plugin

rvm plugin: update to ruby version helpers and rvm-update
Merge pull request #1919 from dongweiming/breaking-change-bower

The current version of bower is completely unavailable, plugin depthmodification
Merge pull request #1916 from okuramasafumi/master

Change duplicated alias name
Merge pull request #1920 from dongweiming/update-coffee

Update coffee completion
Merge pull request #1764 from johnjohndoe/feature/rails3-autocompletion

Add autocompletion for Rails3.
fixed typo in tmux plugin
Merge pull request #1935 from mateitrusca/master

typo in tmux plugin
fix the open command in linux using xdg-open
Update README.textile

Add upgrade command to docs. I canceled the prompt once and went hunting for this so I could upgrade.
added new alias for folder size and global aliases for sorting
virtualenv cleanup: replaces subshell with prompt expansion.

* :t parameter expansion returns the last portion of the path,
  equivalent to basename. I <3 zsh.
* adds comments for the VIRTUAL_ENV_DISABLE_PROMPT,
  used by virtual_env activate

See also:
  http://zsh.sourceforge.net/Doc/Release/Expansion.html#Parameter-Expansion
virtualenvwrapper plugin cleanup

* removes cd override by using chpwd_functions
* removes subshell call to which by using $+commands array and
  c param expansion to find in PATH
* zsh love!
Add new plugin for homebrew installed version of postgres
debian plugin: ignore alias in sudo/aptitude check
Escape both % and $ in the command line

Fixes issue #1884