deleted unnecessary custom plugin
Merge branch 'master' of github.com:tunix/oh-my-zsh

* 'master' of github.com:tunix/oh-my-zsh: (124 commits)
  changed existing vagrant aliases
  changed existing vagrant aliases
  changed existing vagrant aliases
  added new aliases and changed existing ones
  added vagrant aliases
  Revert "Cancel update if the current user doesn't have write permissions for the oh-my-zsh directory."
  Cancel update if the current user doesn't have write permissions for the oh-my-zsh directory.
  Making auto-correction off by default
  Update git-flow-avh 1.7.0
  source ~/.profile only if it exists
  Change `bi` alias to a function
  Fixed lines 32, 33, 34 where one 'p' was missing in 'zypper' command.
  Adds the hgsl alias for one-line shortlog convenience
  Added migration notification for rails plugin
  Add FreeBSD support for autojump plugin
  Added Amuse zsh theme
  wd.plugin: Added checks, readme and completion
  wd.plugin: Fixed nested dirs
  Update _pass to follow symlinks for completion
  Use precmd hook for updating OS X proxy icon
  ...