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Fixes #2182

Just activate word-splitting.

- Allows for the user to turn on auto-correction using the
$ENABLE_CORRECTION variable
- Adds aliases regardless of variable assignment to aid users that use
setopt to turn correction back on in their zshrc

background.

We can easily see which color we want to set when changing the PS1 shell variable,
since the colors are more distinctive.

Fixes issue #1884

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

oh-my-zsh.