refs #5520
- all errors (or just one if property is specified) are cleared before running the checks to make sure that old errors get cleared
- fixed up validators to be slightly more sane as mutually exclusive tests aren't all being checked if one fails
closes#5336
- creates gh-form-group component to handle form group status
- refactors current validation methods to work on a per-property basis
- adds gh-error-message component to render error message
- removes (comments out) tests that pertain to the old notifications until the new inline validation is added
