refactor(superdesk): introduce superdesk.menu module

Makes menu/notifications opening using model which is shared
via parent directive controller.
fix(media): replace img on load to prevent 0.5 opacity
feat(analytics): add analytics tracking

this is an initial test of analytics in the app.
we want to see what info we can get from it.
fix(analytics): fix template task with ga tracking id
fix(media): add info about recently added items

SD-267
fix(media): fix several styling issues