fix(ngInclude): allow ngInclude to load scripts when jQuery is included

In 1.2, the behavior of ngInclude was modified to use DOM APIs rather than jqLite. This means that
even when jQuery was loaded, ngInclude was not calling into it, and thus scripts were not eval'd
as they had been before. Although the use of ngInclude to eval scripts as a lazy-loading strategy
was never an intentional feature, this patch restores the ability to do so.

Closes #3756
fix($animate): ensure the DOM operation isn't run twice

Depending on the animations placed on ngClass, the DOM operation may
run twice causing a race condition between addClass and removeClass.
Depending on what classes are removed and added via $compile this may
cause all CSS classes to be removed accidentally from the element
being animated.

Closes #4949
fix(ngClass): ensure that ngClass only adds/removes the changed classes

ngClass works by removing all the former classes and then adding all the
new classes to the element during each watch change operation. This may
cause transition animations to never render. The ngClass directive will
now only add and remove the classes that change during each watch operation.

Closes #4960
Closes #4944
Merge branch 'master' of https://github.com/angular/angular.js
componentizd!