Radio Buttons not tabbable

[jzhang300]

The current implementation of the radio buttons can't be tabbed:

<input type="radio" name="dialog-template" id="pizza-radio" value="blah" class="base--radio">
<label for="pizza-radio" class="base--label radio-group--label">Order A Pizza Template</label>

<input type="radio" name="dialog-template" id="tech-support-radio" value="blah" class="base--radio">
<label for="tech-support-radio" class="base--label radio-group--label">Tech Support Template</label>

<input type="radio" name="dialog-template" id="movie-radio" value="blah" class="base--radio">
<label for="movie-radio" class="base--label radio-group--label">Movie Template</label>
...