Bug 951159 - Convert Gaia UI Tests to new notification API
Revert "Bug 946556 - [Music] Disable the play controls when using a bluetooth headset in a call"

This reverts commit a69025bfe657a07cca372369e0d4b83a442fba73.
Bug 924624 - [User story] Add edge gestures to FTE tutorial r=arcturus
Merge pull request #15994 from samjoch/bug-924624-UserStoryAddEdgeGesturesToFTETutorial

Bug 924624 - [User story] Add edge gestures to FTE tutorial r=arcturus
Merge pull request #16015 from gentlefolk/951159

Bug 951159 - Convert Gaia UI Tests to new notification API
Merge pull request #16020 from dominickuo/revert-bug-946556

Revert "Bug 946556 - [Music] Disable the play controls when using a bluetooth headset in a call
Bug 966951 - "Group Call" is inactive when received call is hung up
Merge pull request #15955 from Rik/inactive-group-after-finishing-call-966951

Bug 966951 - "Group Call" is inactive when received call is hung up r=etienne