Add codekit configuration file

CodeKit is what I use. If you use it too, great. If not, never mind.
Add ability to toggle using checkboxes and radio buttons

For checkboxes and radio buttons, the toggling of classes on the trigger
element is not available, yet. The use case behind the requirement for
this enhancement did not include that. I will get round to testing it at
some point in the future.
Merge pull request #14 from abitgone/feature/classtoggle/checkboxes-and-radiobuttons

Add Checkbox and Radiobutton Support to ClassToggle