Add ng-classes to gravityForms component

[camilodelvasto]

The rendered form should have ng-classes like ng-dirty/ng-valid/etc so that validation while tyiping can be used. It should cover:

• invalid field
• touched field
• invalid form (so that we can apply cursor:disabled to submit button)

[adamf321]

Doesn't angular add these automatically?

[camilodelvasto]

That's what I'm wondering.... Some classes are there, though not all them, but they don't change as user types (always assigning ng-pristine)

[chrisweight]

https://github.com/moxie-leean/ng-patternlab/pull/44 addresses this :)