Bug 1017333 - Clear notifications when we open the call log

Also don't clear notifications when we reopen the dialer app on another tab
Merge pull request #20791 from mnjul/bug_1027536_lockscreen_clock_stall

Bug 1022984 / Bug 1027536 - After Restarting Phone, Lockscreen Time Always Shows as 5:32 or Is Stalled. r=gweng
Merge pull request #20901 from etiennesegonzac/bug-1028002

Bug 1028002 - Make sure an appWindow is in 'opened' state once we got the animationend and mozbrowserloadened instead of waiting for the opening timeout. r=timdream
Merge pull request #19819 from gitmai/bug-1017581-error-settings

Bug 1017581 -Usage app shows nothing post upgrade
r=salva