Bug 888184 - Remove the canvas-based animations introduced in the workaround for bug 822345

- Removed the JavaScript code used to create the animations
- Removed the unused PNG files
Merge pull request #10751 from gabrielesvelto/bug-888184-v1-train

Bug 888184 - Remove the canvas-based animations introduced in the workaround for bug 822345 r=alive
Bug 854759 - maintain the correct app size with keyboard when the
attention screen is hidden. r=Alive
Bug 840147 & Bug 877903 : fix orientation problem on open/close app animation.
                          * Open app by real device orientation
                          * Refactor setAppSize and rotateTransition to AppWindow
Bug 890079 - Homescreen grid tests failing in TBPL with: document.createTouch is not a function r=crdlc a=npotb

don't try to send touch events if document.createTouch is missing.
(cherry picked from commit 3f51aa0913ad86b50abd97d2b25e07b59677708c)