Bug 988909 - Context menus for dynamic panels. r=lucasr, a=sledru

Bug 988909 - Move ContextMenuInfoFactory out of HomeListView and into HomeContextMenuInfo. r=lucasr
* * *
Bug 988909 - Support context menus in PanelViews. r=lucasr
Bug 981689 - Show a notice to beta users when we turn telemetry on by default on the beta channel - Firefox Desktop. r=bsmedberg, a=sledru
Bug 983481 - Open a post activation landing page. r=markh, a=lsblakk
Bug 1000423 - Properly convert from appunits/layout device pixels to layer pixels for composition bounds calculation. r=botond, a=lsblakk

To get layer pixels (doesn't matter which layer, they are all the same to layout because there is no async transform) you need to multiply by the cumulative resolution.

The fact that our units system says that multiplying by the parent resolution will work is a problem with our units system.
Bug 1006026 - Remove duplicate distclean:: rule in rules.mk. r=mshal, a=sledru
Bug 1007129 - Use MOZ_APP* to define target includedir path instead of LIBRARY_NAME. r=glandium, a=sledru