Don't store committer in revision info

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Show revision in About dialog

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Change name to Nuvola Player 3 Alpha

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>
Show revision in nuvolaplayer3 --version

Signed-off-by: Jiří Janoušek <janousek.jiri@gmail.com>