MouseTracker - Improved IE 9+ compatibility

MouseTracker Improvements

Remembered to change the test shim as well.

Conflicts:
changelog.txt

This reverts commit d582a9563f80b3352b4259df881aad049d009c45.

This reverts commit 1bdb83dc583889582c23d7276659143bdaf41fee.

fixedConflicts:
src/openseadragon.js

Fixed: DZI tilesource was broken

fixed Conflicts:
changelog.txt
src/viewer.js

Added preserveOverlays option to Viewer

* Exposed secondary pointer button (middle, right, etc.) events from MouseTracker and through vie...

Various collections fixes

MouseTracker - Added explicit pointer capture for touch event model events

MouseTracker fixes for #502, #518, #527

Fix the jobLimit of the imageLoader

Adds readonly property to .keyboard-command-area to prevent
input, but allow keys to be captured.

fixed Conflicts:
test/demo/collections/main.js

IE8 fixes for DZI and World.removeItem

All files are downcased so far.

Currently jobsInProgress was not incremented after adding a job. So it
has gone into the - range...

Fixes #490

Viewport tests

Using highsmith for animation demo

The canvas click listener will now check if keyboard-command-area has
focus, and if it does not,...

Animation demo

tiledImages can now animate their positions and sizes

fixed Conflicts:
test/demo/collections/main.js

Auto-resize now works for multi-image

Collections stretch goals