Merge pull request #8197 from KevinGrandon/bug_836365_dialer_performance

Bug 836365 - Dialer load performance improvements. r=etienne(cherry picked from commit d961f0f1fdf5b769f662aa04728f1cf8cb5653a8)

Conflicts:
	apps/communications/dialer/js/dialer.js
	apps/communications/dialer/js/handled_call.js
	apps/communications/dialer/js/keypad.js
	apps/communications/dialer/js/recents.js
	apps/communications/dialer/js/telephony_helper.js