Merge pull request #125 from sbesson/125_label_comments

Teach `scc merge` to parse comments for labels
Add unit test for scc version called from another Git repository
Remove test description
Merge pull request #122 from sbesson/122_version_fix

scc version is overwritten when called from a Git repository
Refactor the tearDown() method in TestRebase

Fetch the remote first and check for a source_branch and a target_branch on
the remote before deleting them
Refactor upstream remote renaming logic in sandbox
Add failing test for scc rebase --remote
Update Rebase Command to inherit from GitRepoCommand

- Initialize repository with init_main_repo()
- Set shallow argument to True and reset argument to False by default
- Update Rebase.rebase() to use self.main_repo
Reuse low-level list_remote() method in get_remote_info()
Refactor get_remote_info() and define a low_level get_remote_url()
Add logic to re-use existing remote if available

Tries to use the remote named with the same name as the connected user.
If fails, defaults to pushing the branch using the URL.
Add checks for rebased branch on the remote and rebased PR
Check scc rebase fails without --remote if the origin has been renamed
merge master -D org -I include -E exclude: PR 128 (scc rebase: bug fix and improvements)