Allow branch names that contain '.'
Allow branch names that contain '.'

Currently git-publish is unable to detect tags that contain '.'.  This
means automatic numbering is broken for branches with '.'.  It's easy to
fix the regular expression and allow such branch names.

Signed-off-by: Stefan Hajnoczi <484520986196e4a799496429ce8a499eb6488adb@gmail.com>

stefanha/git-publish,stefanha/git-publish