Merge pull request #21824 from mcjimenez/bug1039222

Bug 1039222 - [SingleVariant] Removed maximum MMS size customization (r =jmcanterafonseca)
Merge pull request #21955 from arcturus/bug-1038414

Bug 1038414 - [B2G][Contacts][Camera][273MB Flame] Camera app OOMs when adding picture to contact r=jmcf
Merge pull request #21934 from acperez/bug-1040700

Bug 1040700 - Modify APN for ATT because last update doesn't work as expected. r=jaoo
Merge pull request #21862 from lodr/bug-1039984-smartcollections-and-homescreen

Bug 1039984 - [System] Trying to open a smartcollection after killing th...
Merge pull request #21914 from KevinGrandon/bug_1040686_homescreen_settings

Bug 1040686 - [Homescreen] Remove column settings section
Conflicts:
	apps/settings/elements/homescreen.html
Merge pull request #21957 from khuey/willReadFrequently

Bug 1041112: Add willReadFrequently to grid_icon_renderer to avoid hitti.... r=kgrandon
Merge pull request #22000 from guilherme-pg/bug1041591-can-disable-logout

Bug 1041591 - Don't set 'findmydevice.can-disable' if not registered on ...