feat($compile): support multi-element directive

By appending  directive-start and directive-end to a
directive it is now possible to have the directive
act on a group of elements.

It is now possible to iterate over multiple elements like so:

<table>
  <tr ng-repeat-start="item in list">I get repeated</tr>
  <tr ng-repeat-end>I also get repeated</tr>
</table>
feat(ngdocs): provide support for inline variable hinting
docs(): Rectify animator.animate documentation
fix($animator): ensure $animator calculates the highest duration + delay for and transitions and animations together
fix(jqLite): Added optional name arg in removeData

jQuery's API for removeData allows a second 'name' argument to just
remove the property by that name from an element's data. The absence
of this argument was causing some features not to work correctly when
combining multiple directives, such as ng-click, ng-show, and ng-animate.
chore(docs): add reference to the blog

Add a reference to the blog at the documentation.
fix(ngController): fix indentation bug which causes example to mess up