Add .gitattributes

Needed for changelog

Change-Id: I9909608663cdb4623dd8feff758b43a7a979ea32
Update dependencies

 * Require the latest versions of mono packages
 * Demote fieldworks-movies to "Recommends" in metapackage

Change-Id: Id650380526a608cc52eaa84a7f4f5222ada49706