Fixed missing retcode function
Update the character used in powerline

The code points have been updated in 53fbfe1, see
- https://github.com/Lokaltog/powerline/commit/53fbfe15fead8cc7598bcb4ee9714a221ab7e446
- https://github.com/Lokaltog/powerline/issues/4
Update bundler.plugin.zsh

Added berks, foodcritic, kitchen, and knife commands to bundler plugin.
Update bundler.plugin.zsh

Added strainer & tailor to commands in bundler plugin.
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!
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
Escape both % and $ in the command line

Fixes issue #1884
Fixed slow behavior when using GitHub wrappers
Merge pull request #1878 from spazm/virtualenv-cleanup

virtualenv cleanup: replaces subshell with prompt expansion.
Merge pull request #1877 from spazm/virtualenvwrapper-cleanup

virtualenvwrapper plugin cleanup
Do not clear tab when calling it with an argument.
Add new plugin for homebrew installed version of postgres
debian plugin: ignore alias in sudo/aptitude check
Merge pull request #1893 from jeremydt/postgres

Add new plugin for homebrew installed version of postgres
Merge pull request #1894 from codewhale/master

debian plugin: ignore alias in sudo/aptitude check
Merge pull request #1885 from eakret/termsupport-fix

Escape both % and $ in the command line
Merge pull request #1756 from rkj/master

Fixed missing retcode if you tried to use themes/rkj
Merge pull request #1889 from jerolimov/patch-1

osx-plugin: Do not clear new tab when calling it with an argument.
Merge pull request #1887 from tgkokk/git-slow-fix

Fixed slow behavior when using GitHub wrappers
Merge pull request #1873 from charlesjohnson/bundler-plugin

Update bundler.plugin.zsh