Bug 961800 - Implement Child Window Factory

Conflicts:
	apps/system/js/app_transition_controller.js
	apps/system/js/app_window.js
	apps/system/js/app_window_manager.js
	apps/system/js/cards_view.js
	apps/system/style/window.css
Merge pull request #17363 from yurenju/stage2

Bug 897352 - [gaia build system] Transition to a build_stage for assembl... r=@ochameau
Bug 984574 - JSHint fixes. r=kgrandon
Bug 985090 - Fix voicemail number migration issue and refactor
Merge pull request #17369 from yurenju/nfc

Bug 963556: Update NFC Manager, Handover to use new shared nfc_utils.js. r=@alivedise
Bug 980344 - [FTE] Fixed some jshint errors
Merge pull request #17370 from alivedise/bugzilla/961800_master_merging/child-window-factory

Bug 961800 - Implement Child Window Factory, r=etienne
Bug 981401 - [Messages] Notification does not vanish when the SMS is read when going back from sleep
Revert "Bug 897352 - [gaia build system] Transition to a build_stage for assembling apps" for Breaking Windows Builds

This reverts commit 91c8fd2a33c9be6a745a3f30a6e5113831655502.
Merge pull request #17330 from steveck-chung/bug-981401

Bug 981401 - [Messages] Notification does not vanish when the SMS is read when going back from sleep. r=arcturus
Bug 984251 - ./bin/gaia-test and Travis-CI unit tests should be working with test_apps
Revert "Bug 961800 - Implement Child Window Factory" for Gaia UI Test Bustage

This reverts commit 0cd5228663d8563831f0156e85ae8225d2004a3c.
Bug 981882 - Update input field design
Bug 985927 - Button locator changed for test_window_open_inside_iframe.TestWindowOpenInsideIframe
Merge pull request #17385 from AndreiH/bug_985927

Bug 985927 - Button locator changed for test_window_open_inside_iframe.T...
Merge pull request #17361 from RickyChien/bug-984251

Bug 984251 - ./bin/gaia-test and Travis-CI unit tests should be working with test_apps r=@yurenju
Bug 983054 - [DSDS][Dialer] Only fill active number instead of calling from suggestions bar on dual SIM devices. r=rik
Merge pull request #17287 from DouglasSherk/983054-dsds-suggestions

Bug 983054 - [DSDS][Dialer] Only fill active number instead of calling from suggestions bar on dual SIM devices. r=rik
Bug 962659 - [B2G][Contacts] Adjust Remove and Cancel button's position and style in contact deletion confirm for better use experience.
[Bug 984315] Fixing flexboxes in contact button

[Bug 984315] Add "carrier" class to the element

[Bug 984315] Proper HTML & styles for the carrier

[Bug 984315] Displaying coma when needed

[Bug 984315] Console logs removed

[Bug 984315] Contact button flex fix

[Bug 984315] Call icon padding fix

[Bug 984315] Moving styles to CSS

[Bug 984315] Last polishing

[Bug 984315] Tests update

[Bug 984315] Use L10N instead of plain text

[Bug 984315] New tests for contact details

[Bug 984315] Lint fixes

[Bug 984315] CSS fix for button padding

[Bug 984315] Merge fix