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before, 128 was returned, which could display an error,
but out of a git repo this should exit silently
fixes #2226

In this commit, the option only works for git but it should not be to hard for
someone who knows svn to so the same.
This commit is largely inspired by @yoavweiss, I only added an option to use
it.

If oh-my-zsh.hide-status is configured, the 'clean' code won't be
generated, and some themes might end up distorted. Let's generate the
'clean' code even when we don't want the show the dirty status.
Signed-off-by: Felipe Contreras <felipe.contreras@gmail.com>

The grep expression was incorrect for normal grep. Adding
the `-E` option fixed the escaping of the question marks.

Tweaked parse_git_dirty() in lib/git.zsh to support proper dirty/clean parsing against both git 1.6 and git 1.7+

# Changes to be committed:
#   (use "git reset HEAD <file>..." to unstage)
#
#	modified:   git.zsh
#, ignoring untracked files, which seems to be the primary cause for slowness

This patch makes git_prompt_status support three new status variables:

 - ZSH_THEME_GIT_PROMPT_AHEAD
 - ZSH_THEME_GIT_PROMPT_BEHIND
 - ZSH_THEME_GIT_PROMPT_DIVERGED

With these extra variables it's easy to see (1) if you have commits in
your local branch that weren't pushed to the remote (AHEAD), (2) if
there are commits in the remote that you haven't merged/rebased yet
(BEHIND) or (3) if you have local unpushed commits AND the remote has
some commits you haven't merged yet (DIVERGED).

Refer to the first line displayed on `git status -b --porcelain`.

An example setup in a .zsh-theme file would be:

ZSH_THEME_GIT_PROMPT_AHEAD="↑"
ZSH_THEME_GIT_PROMPT_BEHIND="↓"
ZSH_THEME_GIT_PROMPT_DIVERGED="↕"

For certain git repositories, this slows down usage
of the shell horifically.

This option can be set with

    git config --add oh-my-zsh.hide-status 1

which will disable checking/showing the status notification

Changes method git_parse_ahead() on git.zsh lib file. Before this
change it checked directly against origin/master branch. Now it
uses $(current_branch) to check for not pushed changes against
the current remote branch.

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

Added new function git_remote_status to check if we are ahead, behind or diverged from the remote branch

Initial implementation of a new plugin system, so that people can managed which aliases/functions they want.

(via git status -s, benchmarked)