Conflicts:
	gitflow

- now works as sub commands to git if copied to $(git --exec-path)
- now works with arbitrary commands for branch types
- consistent variable names
- new branch type 'support' for long-term support branches of historic
  versions
- preliminary base branch support for hotfix branch type to create
  hotfixes form support branches

Don't do --no-ff merges for feature branches that exist of a single commit (no benefits are gained in those situations, only complexity is added).

Functionally implemented the gitflow-feature subcommand. Starting and finishing feature branches is now possible in your repos.

Use a safer, more reliable way of determining what branches are available, by parsing the 'git branch' output instead of depending on files in the FS.