Use an abstract method in BackboneMixin for resource

Instead of modifying the public API of the object that was mixed, put
the onus on the object to implement the `getResource` method.
Remove IE compatibility flag since support is IE9+
Prefer quotation mark to apostrophe for all attrs

#style
Upgrade to jQuery 2.0.3; no functional changes

Smaller file size is the big win here.
Parse instances as an integer, fix scaling button

Values from `prompt` calls are returned as Strings, and in this case the
instances needed to be parsed as integers. Scaling broke when validation
was added to the model since it expected "instances" to be a Number.
Compile JS with working "Scale" button