Bug 1004329 - [Flatfish][Homescreen] Returning home (landscape) from portrait app causes app icons to misalign/overlap

* Fix ScreenHelper width/height error due to mediaQueryListener being fired twice right after maketplace app closed.
Bug 1053728 - App icon size incorrect from rocket bar search result
Bug 1047276 - [Vertical Home-screen] Change in position of smart collections in default-Homescreen json doesnt reflect on screen
Bug 1045236 - contacts import screen has a strange notion of "TODAY", which includes yesterday
Bug 1049489 - gaiatest: execute all ContactsAPI calls in chrome context
Bug 1038815 - Contacts can get into a 'frozen' state in some cases
Make gecko recording errors display a generic error message instead of nothing
Fix copy and paste error (and source) for error callback prototype
Bug 1054333 - Create Firefox OS test job for testing phone specific features per checkin
Add brief comment clarifying why we ignore err param
Add 'browsing' icon to shared/icons.css
Bug 938177 - Add 'browsing' icon to shared/icons.css r=kgrandon
Revert "Add 'browsing' icon to shared/icons.css"

This reverts commit 0e53c0e2b5f4cfc2e2c9498427034156a20b6551.
Bug 938177 - Add 'browsing' icon to shared/icons.css r=kgrandon
Merge pull request #22920 from shamenchens/Bug1053728-RocketBarSearch

Bug 1053728 - App icon size incorrect from rocket bar search result, r=kgrandon
Merge pull request #22025 from begeeben/1004329_returning_home

Bug 1004329 - [Flatfish][Homescreen] Returning home (landscape) from portrait app causes app icons to misalign/overlap, r= Cristian Rodriguez (:crdlc)

* Fix ScreenHelper width/height error due to mediaQueryListener being fired twice right after maketplace app closed.
Bug 800402 - [email/backend] UI: Show the number of unread messages in the message-list header after the folder name. r=asuth

Land the back-end parts of bug 800402 and bug 888955 which it depends on.
The UI parts are separable and we're landing the back-end stuff on its own to
avoid back-end bit-rot.

The changes in here exactly correspond to those in:
https://github.com/mozilla-b2g/gaia-email-libs-and-more/pull/328
Bug 1055908 - Add missing unit-tests for bug 1035117
Merge pull request #23027 from crdlc/bug-1047276

Bug 1047276 - [Vertical Home-screen] Change in position of smart collect...
Bug 1055951 - [Flame][v2.1] test_settings_wifi.py :: Element cannot be found and cannot connect to specific network failed