Please Add Validation States

[mavrick]

Would love to see built-in support for: http://getbootstrap.com/css/#forms-control-validation

tyvm

[aaronroberson]

Specifically .has-feedback on form-group would be nice! I would also like to add my own classes to the .form-group element.

See http://getbootstrap.com/css/#with-optional-icons
See https://gitter.im/formly-js/angular-formly/archives/2015/04/13

This is also mentioned in the bottom of the conversation of #5.

[mavrick]

I've found the html wrapper code for the input elements.

What would be the best way to enable the .has-feedback class when constructing the field json? Would you make it part of the custom data object or include it within the validateOptions function?

Cheers