Feat/javascript templates

I added javascript templates to the template options for this plugin.  I liked the HTML5 boilerplate templates but I also do a lot of javascript development, specifically Angular.js development.  I wanted to be able to use this plugin to drop in javascript skeletons so I wouldn't have to retype them each time I was creating a new file or component.

I added a javascript option to the UI modal and logic for selection to the switch statement in the main.js file.

I wasn't sure if javascript templates (which, given the number of javascript libraries out there) would be appropriate in this plugin, but I figured a pull request would be the best way to find out.

Thanks!