Feature: Implement radio style controls

[DimMount]

<input type="radio" name="radio1" checked class="switch-radio1">
<input type="radio" name="radio1" class="switch-radio1">
<input type="radio" name="radio1" class="switch-radio1">

example from http://www.bootstrap-switch.org/examples.html

[Julusian]

Radio controls are not currently supported by this project due to lack of personal need for it.
I will happily accept a PR for it (please base on the es6-rewrite branch if so), otherwise I can try to take a look in a few weeks once I am back from my holiday.