Option to source one contributer from command line

[Enyium]

If the argument after --rewrite-contributors starts with a colon, which can't happen for file paths on Windows, please take the text after the colon as the contributer file's contents.

Instead of:

GitRewrite --rewrite-contributors contributors.txt .git

This would spare you to create an intermediate file and allow you to write:

GitRewrite --rewrite-contributors ":Old User <[email protected]> = New User <[email protected]>" .git