[Git] Add many aliases.

Change-Id: Ia490ca44af19a3606d94df4d630c58b911a6ed44
Signed-off-by: Wei-Chung Wen <morisato3711@gmail.com>
[Vim] Ignore case when completing directory/file.

Change-Id: Ie0db0e70e26e1d47c532f26cf47dc0a75541c1cf
Signed-off-by: Wei-Chung Wen <morisato3711@gmail.com>