Added commands to continue and abort running rebase
Wait for git to exit
Added stash and status support
Moved GitCommand closer to sublime commands
Pass the current working dir to subprocess.Popen
Allow to pass environment variables to run git command
Replaces generic rebase command with `edit_revision`
Use config value instead of trying to guess the path to git
Do not escape env vars
Use `git rebase --autostash` instead of checking if the workspace is clean and stashing explicitly.