Drop friends packages from images

There are obsolete friends related packages on the images that are not needed anymore:

ii friends 0.2.0+14.10.20140714.2-0ubuntu1 armhf Social integration with the desktop
ii friends-dispatcher 0.2.0+14.10.20140714.2-0ubuntu1 all Social integration with the desktop
ii friends-facebook 0.2.0+14.10.20140714.2-0ubuntu1 all Social integration with the desktop - Facebook
ii friends-twitter 0.2.0+14.10.20140714.2-0ubuntu1 all Social integration with the desktop - Twitter
ii libfriends0:armhf 0.1.2+14.10.20140709-0ubuntu1 armhf Provides an API for accessing social networks
ii qtdeclarative5-friends0.2 0.2.0+14.04.20140317-0ubuntu1 armhf QML Bindings for the Friends library