Added LabelTextHoverStyles support + Extras

I've updated the js file to support the styles for the label text on hover. These had been named but not defined.
I've also done a few extra updates:
 - updated file name in the example.
 - added examples of labelTextHoverStyles being used in the index.html
 - cleaned up blank spaces in index.html and jquery.usmap.js as well as a couple semicolons which were highlighted by jslinter