[PATCH] git grep colorized

Hi guys,

recently I try to put some colors on my git-grep and found a patch
from Nguyễn Thái Ngọc Duy [off-list ref] to do it!
The problem with this patch is that it doesn't support the config file
to persist the color option on grep.

I took the liberty to change his patch and add support to config files
and bash completion.

Attached is the resultant patch!

I hope this could be useful to someone.

Thiago dos Santos Alves
Computer Scientist

thiago.salves@gmail.com
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"Man's mind, once stretched by a new idea, never regains it's original
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