Parse git raw message

[goal1860]

Within the current implementation, it removes 8 leading chars from git diff --name-status result for each candidate. However on my Mac for some reason it is \t between the modification flag and the file name. For example, instead of
M <File Path>
it is actually M\t<File Path>
I guess it is something configurable but we'd better handle it since there are must be some people with same git settings as I do.