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[wd] New minor release

Replace /usr/bin/env with env

Fix missing add-zsh-hook

Update tmuxinator autocompletion

#git plugin git diff-tree --name-only added

This alias is conflict cause. 

Add Composer's local binaries to PATH

Added 'uninstall' command to brew completion

Fix issue with homebrew installed awscli

Add a CONTRIBUTING file to instruct people on issues and pull requests

the mangled version installed into $(brew-prefix)/bin if using
homebrew installed awscli on OSX.

This was discussed here - https://github.com/Homebrew/homebrew/issues/30268

Current completion plugin isn't up to date and #2075 PR, which is also
the completion plugin on the official tmuxinator repository, doesn't
work. Thus this should do the trick for the moment.
Also suppressed an error when no completion is available

In older version of zsh, `add-zsh-hook` is not available, causing issues like:

```
/Users/hugo/.oh-my-zsh/lib/termsupport.zsh:32: add-zsh-hook: function definition file not found
/Users/hugo/.oh-my-zsh/lib/termsupport.zsh:33: add-zsh-hook: function definition file not found
```

See https://github.com/robbyrussell/oh-my-zsh/issues/748. This patch pulls in the changes suggested in https://github.com/robbyrussell/oh-my-zsh/issues/748#issuecomment-37862691 by @mcornella and I have tested it on RHEL 5.

Some environments (such as Android) does not have /usr/bin.

Update README.textile

Update rvm.plugin.zsh

Ruby 2.1.1 -> Ruby 2.1.2.

Added instructions for installing zsh (due to the problems with first time zsh users)

Update brew.plugin.zsh

Add `brew cleanup` command to `bubu` alias

is useful if you want to install a local gem from the filesystem

"/usr/bin/python2" does not exist on Mac OSX (see #2382), so fuck people who have
"python" symlinked to "python3"

This reverts commit e5ed07e2

generalized symfony2 console directory

Bundler fixes