Add Dirs.vala for xdg dirs
Use Dirs.config for account data
Merge branch 'master' of https://github.com/baedert/corebird
Corebird: Use new Dirs namespace
Dirs: Fallback to ~/.corebird for data dir
Switch from Utils.user_file to the Dirs namespace
Utils: Use GDateTime to show the month

It depends on the currrent locale this way.