LB-377: Redesign the sources tabs

fixed.
LB-443: Can't publish post after receiving error

fixed.
NR-943 : Switch article edit page navigation on Backbone.Router

fixed
LB-356 : Add Facebook as a social source

Quick fix
LB-459 : Internal error happens when try to remove obsolete files from Media Archive
LB-435: Upload avatar

fixed.
NR-873: Task plugin

Implemented user image reference