docs(ngBindHtml): add example

Closes #4427
docs(tutorial/step_00): reword sentence to make sense

Closes #4429
docs(select): fix typo

Closes #4433
docs($routeProvider): document route.resolve rejection

Add documentation that the $routeChangeError event is fired when a
route resolve promise is rejected

Closes #4447
docs(error/multidir): improve the sentence fluency

Closes #4449
docs(ngModelController): $parent can help isolate scope directives
fix($animate): skip unnecessary addClass/removeClass animations

Skip addClass animations if the element already contains the class that is being
added to element. Also skip removeClass animations if the element does not contain
the class that is being removed.

Closes #4401
Closes #2332
style($route): fix line length