Support new Vagrant commands

Vagrant 1.6 introduced the `global-status` command which allows
to get a quick overview of all active Vagrant environments for the
currently logged in user.

Vagrant 1.5 added Vagrant Cloud to share boxes. Some boxes
may be protected, the `login` command allows to access those
protected boxes from Vagrant Cloud.

Vagrant 1.5 introduced Vagrant Share to allow remote access to a Vagrant
environment. This adds support for the `share` and `connect` commands.

Vagrant 1.6 introduces a couple new commands, including the `version` command.
The `version` command shows the currently installed version information and
also checks for new updates available.

Update to latest per-directory-history

Various fixes on zsh_reload plugin

Spelling correction in itunes control function.

Correct redirection of stderr

`fc -l 1` instead of `history` in zsh_stats, fixes #2501

Makes history-substring-search use term specific up and down buttons.

don't add --exclude-dir to GREP_OPTIONS on FreeBSD

Fix for Python3

Fix `docker rmi` tab completion

This is exactly what happens on tab completion for docker rmi. This commit
fixes that.

```sh
$ docker rmi <hit TAB>
_arguments:comparguments:312: invalid argument: __docker_images
_arguments:comparguments:312: invalid argument: __docker_images
_arguments:comparguments:312: invalid argument: __docker_images
```

In Python3 without universal_newlines set to True
output from Popen was byte-encoded.

Spelling correction in itunes control function.

Added git support for merging, rebasing, and bisecting to agnoster theme

Remove mailcatcher from bundler plugin

The mailcatcher gem does not work correctly when executed through Bundler.

add brew-cask plugin

The intention of the redirection to /dev/null is to hide the output
'hash: no such command: git' since we rely on the exit status.

However, the output goes to stderr, so it's stderr that needs to be
redirected. For completeness, we redirect both stderr and stdout using
'2>&1'.

Example:

  [~]$ hash git > /dev/null
  [~]$ PATH=''
  [~]$ hash git > /dev/null
  hash: no such command: git
  [~]$ hash git > /dev/null 2>&1
  [~]$

Docker autocomplete plugin is not up to date with recent versions.

Fix Emacs plugin

Fix escaping of $CMD of automatic title

Allowing path with spaces in pow plugin

Plugin: Rake-fast: Support both *nix and Darwin

Adding a README.md for plugins/jsontools

New aliases for 'apt-get' and 'aptitude' as they were overwritten by lat...

Fixed typos + made wording more consistent in zshrc.zsh-template

Add README file to rake-fast plugin

Fix broken reverse-menu-complete keybinding.

adding urldecode_json to compliment urlencode_json and updating readme.md; slight tweak to urlencode_json from previous commit

<B> Designates Bisecting
>M< Designates Merging
>R> Designates Rebasing