Adding Marked 2 plugin (OS X only)

Adding Textastic plugin (OS X only)

Add autocompletion for adb

Exit early from git plugin if not in git repo.

Update pass completion and fix syntax and autoloading

Easy-to-Merge via @ncanceill... our hero!

[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

When autocompleting from `pass <TAB>', sometimes the following errors
appear:

  _values:compvalues:10: not enough arguments
  find: `/home/user/.password-store': No such file or directory
  _values:compvalues:10: not enough arguments
  find: `/home/user/.password-store': No such file or directory

The `_values' error happens when there is no password-store folder *or*
there are no passwords in pass; the `find' error only when there is no
password-store folder.

We can trace it back to line 108, which contains the only `_values'
statement that is executed when we autocomplete from pass. We confirm
this by following the trail of execution, which is

  _pass -> _pass_cmd_show -> _pass_complete_entries ->
        -> _pass_complete_entries_helper

If we try running the command inside `$()' on line 104, we see that it
returns nothing and the output is blank. This means that `_values' only
receives 1 of its 2 mandatory parameters, therefore the above error is
triggered (not enough arguments).

That is unless we don't have a password-store folder, in which case the
`find: [...] no such file or directory' error is *also* triggered.

We solve the first error by supplying a default value of "" if the
command outputs nothing, using the zsh construct ${var:-else}.

We solve the second error by redirecting the find command's stderr output
to /dev/null, so the error is effectively suppressed.

* * * *

This patch also fixes the first tab completion, which currently only
loads the completion function definition.

We do this by adding a `_pass' statement at the end of the file, which
runs the `_pass' completion function after loading its definition.
This is the standard way an autoloaded function works; for other examples
look at zsh's official completion files.

Conflicts:
	plugins/pass/_pass

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.