Don't let users pick "whatever.git" as a repository short name, make "." work
- Periods now work in short names.
- If you try to name something ".git", no dice.
- Tried to name something "quack.git", was politely rejected.
- Named something "quack.notgit", and it worked fine.
- Cloned Mercurial and Git repositories over SSH with ".git" and non-".git" variants without hitting any issues.
Reviewed By: chad
Maniphest Tasks: T11902
Differential Revision: https://secure.phabricator.com/D16908