propagate button-release event when ejecting, fixes #169

See also gnome bug https://bugzilla.gnome.org/show_bug.cgi?id=646302
Add option in the UI to set IEC units usage

Closes https://github.com/mate-desktop/caja/issues/293
Bump version to 1.9.1
Handle metadata key deletions (fixes #296)
Merge pull request #298 from bl0ckeduser/master

Handle metadata key deletions (fixes #296)
Sync translations with transifex
Move LIBUNIQUE_VERSION to the other gtk api depenant variables
libunique is no optional

This is most likely the beginning of a GtkApplication port that did not happen.
Merge remote-tracking branch 'upstream/master'