chore(docs): fix back-to-top anchor in angularjs.org doc pages

Closes https://github.com/angular/angularjs.org/issues/45
docs($animate): require ngAnimate in example, syntax fixes

The example in the section "JavaScript-defined Animations" would not run without the ngAnimate dependency. Also added a missing comma and semicolons.
feat(jqLite): provide support for element.one()