Add mouse stop event
Added 'wheel' Event Support

Also improved OpenSeadragon.addEvent()/OpenSeadragon.removeEvent()
'wheel' Event Support Fixes

Whitespace, cancel handling
Added 'MozMousePixelScroll' event handling

For older Firefox versions
Remove cancelEvent + fix typos
Merged changes from master
Fix mousestop event on IE
Merge pull request #263 from msalsbery/wheel-event

Added 'wheel' Event Support (#261)
Merge pull request #262 from avandecreme/mousestop

Add mouse stop event
Changelog for #262