New prompt methods on Git lib file

Modifies the Git lib file (lib/git.zsh), adding three new prompt
methods:

- git_prompt_ahead(): Shows the content of the custom var
  $ZSH_THEME_GIT_PROMPT_AHEAD if the local repository has
  commits ahead from the remote origin repository

- git_prompt_short_sha(): Shows last commit SHA hash in short
  mode wrapped between the content of the custom vars
  $ZSH_THEME_GIT_PROMPT_SHA_BEFORE and
  $ZSH_THEME_GIT_PROMPT_SHA_AFTER

- git_prompt_long_sha(): Shows last commit SHA hash in long
  mode wrapped between the content of the custom vars
  $ZSH_THEME_GIT_PROMPT_SHA_BEFORE and
  $ZSH_THEME_GIT_PROMPT_SHA_AFTER

add my custom zsh prompt

New theme second try

added alias for apt-cache search to deb plugin

Support non-standard rvm install prefixes in bira

Significantly speed up startup time (1.2 seconds for me) by removing redundant compinit calls

Added my theme

new yum plugin with useful aliases

Redis-cli plugin

Adding dogenpunk theme

Install tweeks

Fixed folder naming for mysql-macports plugin and improved start/stop scr

Updated my theme.

Update brew autocompletion

Added a custom theme, based on eastwood

state in git.

Conflicts:
	plugins/github/github.plugin.zsh