adding name attribute of input element as a css class name of the widget

This is the first time I used this thing. It's pretty baller.

This PR just adds a unique css class to the wrapper so it can be distinguished from others. I had the several select dropdowns in the same form, but wanted a way to target each wrappers.

Not sure if this is the best solution. Perhaps a way to specify a wrapper class name in the options is another way to handle it.