allow operation with dense array for Backbone collection
Update images to retina versions, remove images no longer used, minify everything else
Fixes #2812 Model-options-url out-of-date doc.
Merge pull request #2810 from patrickkettner/retinafy-images

Update images to retina versions
refactor to more better fix and add some more tests
Merge pull request #2802 from jdkanani/master

allow operation with dense array for Backbone collection
Clarify collection sync events in event catalog
Merge pull request #2817 from jtwb/patch-1

Clarify collection sync events in event catalog
Use QUnit `raises` instead of `throws`.
`throws` is a future reserved word.
Merge pull request #2818 from lukeasrodgers/use-raises-in-tests

Use QUnit `raises` instead of `throws`
Adding the new new Delicious as an example app.
Upgrading to 1.1, for the docs.