Bug 991906 - [B2G][Homescreen] Long pressing an App that opened in Landscape mode will cause the Dock apps to shift

Conflicts:
	apps/homescreen/js/grid.js
Bug 995886 - Homescreens overlap when process is killed when screen is off
Merge pull request #18049 from etiennesegonzac/bug-993018-place-new-call-activity

Bug 993018 - Replace the "place new call" postMessages with a WebActivity r=rik
(cherry picked from commit d2a70ab329a0f85a1a7fd38c7c9297abd763ee1e)
Merge pull request #18044 from etiennesegonzac/bug-992948-sysmsg-call-log

Bug 992948 - Use the telephony-call-ended sysmsg to record calls r=rik
(cherry picked from commit 04a7f8d951d1ed8bdbe5eaea75b3204792d24fa4)
Merge pull request #20927 from comoyo/bug995886_v1_4

Bug 995886 - Homescreens overlap when process is killed when screen is off
backport fix to Bug 1004138 - Add a step to cleanup_data to eliminate remembered networks
Merge pull request #20699 from dchunwong/upliftwifi

Backport fix to Bug 1004138 - Add a step to cleanup_data to eliminate remembered networks
Merge pull request #18201 from etiennesegonzac/instacallscreen

Bug 990003 - Introducing a dedicated callscreen app for better performance r=rik, alive, 21
(cherry picked from commit 7afce8a6e965a45f38988227828ccdfb315394f3)

Conflicts:
	apps/communications/dialer/js/call_log.js
	apps/system/js/attention_screen.js
	apps/system/js/bootstrap.js
	apps/system/style/attention_screen.css
	apps/system/test/unit/bootstrap_test.js
	build/csslint/xfail.list
	build/jshint/xfail.list
	build/webapp-zip.js