chore(travis): run protractor tests with ff28

FirefoxDriver seems to have an issue with FF29 which is breaking a test case, and causing false negatives.

There is an issue opened on protractor regarding this at https://github.com/angular/protractor/issues/784

Closes #7369
feat(ngBind): add support for bind-once and lazy bind-once

It is now possible to request one-time binding via the ngBind and ngBindHtml directives,
by supplying the attributes `ng-once` or `ng-lazy`.

These attribute names are subject to change, and only affect the immediate element, not
child elements.