Crate autorebase

Functions

autorebase	Autorebase all branches in repo_path onto the onto_branch (typically “master”). If slow_conflict_detection is true it will try every commit when there is a conflict until one works. Reliably but slow. If it is false it will try to detect the first commit that causes a conflict and rebase to just before that. Way faster, but may not always work.
get_repo_path	Utility function to get the repo dir for the current directory.