Bug 1028055 - Sender's email is not displayed In the details page of a received email
Bug 1027463 - Check for element before clearing. r=kgrandon
Bug 839491 - Handle unrecoverable app installs from the homescreen/search/collections apps r=kgrandon
Bug 1027555 - [Vertical Homescreen] No icons on homescreen with DEBUG=1 mode on nightly. r=me
Merge pull request #20842 from vingtetun/homescreen-on-nightly-race

Bug 1027555 - [Vertical Homescreen] No icons on homescreen with DEBUG=1 ...
Merge pull request #20837 from daleharvey/1027463

Bug 1027463 - Check for element before clearing. r=kgrandon
Merge pull request #20841 from KevinGrandon/bug_839491_unrecoverable_app_install

Bug 839491 - Handle unrecoverable app installs from the homescreen/search/collections apps
Merge pull request #20813 from jrburke/bug1028055-email-reader-title

Bug 1028055 - Sender's email is not displayed In the details page of a received email r=mcav
Bug 1025552 - [Messages][Refactoring] Refactor attachment.js and specifically move rendering part to a separate module. r=julienw
Review round#1: more unit tests, more comments, changed naming for attachment content container."
Review round#1: added "encodeURI" for data URL manipulations + added AttachmentRenderer.for method.
Review round #2: removed encodeURI from Utils.imageURLtoDataURL, added few clarifying comments, AttachmentRenderer.createAttachmentContainer is now "private" + updated related unit tests.