…ox regarding true/false values based on selection.

The `text-field` now allows users to bind to the inner `NgModelController` for increased functionality.
The `radio-field` now allows its options to contain HTML for their display.
Minimum and maximum validation rules now display a meaningful validation-failure message by default.
For more information refer to pull-requests #157, #158, #159, and #160.
Thanks to @indrimuska for contributing this release!