`stale_refs()` may now also handle other kinds of references, like tags.
`stale_refs()` may now also handle other kinds of references, like tags.

Fixes #260

ghtdak/GitPython,roidelapluie/GitPython,roidelapluie/GitPython,expobrain/GitPython,manasdk/GitPython,h4ck3rm1k3/GitPython,pengshp/GitPython,cdht/GitPython,zsjohny/GitPython,beni55/GitPython,StyXman/GitPython,h4ck3rm1k3/GitPython,jeblair/GitPython,bwrsandman/GitPython,breavo/GitPython,avinassh/GitPython,dpursehouse/GitPython,manasdk/GitPython,cdht/GitPython,dpursehouse/GitPython,pengshp/GitPython,gitpython-developers/gitpython,gitpython-developers/gitpython,bwrsandman/GitPython,expobrain/GitPython,pengshp/GitPython,gitpython-developers/GitPython,beni55/GitPython,zsjohny/GitPython,nvie/GitPython,avinassh/GitPython,nvie/GitPython,zsjohny/GitPython,breavo/GitPython,StyXman/GitPython,ghtdak/GitPython,gitpython-developers/GitPython,avinassh/GitPython,StyXman/GitPython,jeblair/GitPython,cdht/GitPython,bwrsandman/GitPython