Bug 1110680 - Part 0: fix licenses.
Bug 1110680 - Part 1: import Sync, FxA, token server tests.
Bug 1110680 - Import Sync tests. r=nalexander,rnewman
Fixes 1109643 - Support the WKWebview navigation gestures
Merge pull request #42 from mozilla/st3fan/Bug1109643SupportNavigationGestures

Bug 1109643 - Support the WKWebview navigation gestures
Bug 1109772 - Part 8: lift out Account interface.
Bug 1109772 - Part 9: abstract bookmarks and sharing.
Bug 1109772 - Part 9b: update TestBookmarks.
Bug 1109772 - Part 10: transparently include in-memory saved items in Mobile Bookmarks.

Note that this is currently difficult to manually test, because the
client application is distinct from the sharing application!
TESTING: getting access to the bookmarks UI again.
Review comment: use constants for bookmark root GUIDs.
Review comment: remove errant semicolons.
Review comment: rename createMockFavicon -> createSizedFavicon.
Review comment: have MemoryBookmarkFolder implement SequenceType.
Review comment: make MemoryBookmarkFolder subscriptable.