Release 1.4

Use py2app 0.9

Remove 1.4 entirely from the 1.3.1 branch

Suggested by Freso

Change __version to PICARD_VERSION_STR_SHORT

Merge branch 'master' of github.com:musicbrainz/picard

Increase the version number

Update translations from Transifex

Change the version number to 0.16 final

Update version number

Increase version number