Bootstrap 3 and Help Tab

This is all of the work @simonyeldon and I have done to bring this excellent plugin up to Bootstrap 3 and support nearly all of the Bootstrap components.

This pull request adds a Help Tab to the Wordpress editor which displays the plugin's documentation along with handy buttons to insert the example code into the editor. This was determined to be a more effective way to display all of the available shortcodes while not cluttering up the TinyMCE editor too much.
![16b44e42-1f4b-11e3-9ad5-d9deb2d31204](https://f.cloud.github.com/assets/2457670/1217290/40cf6514-26a2-11e3-937b-d3e940610335.png)
![0f845f90-1f4b-11e3-97e5-178e99d3e668](https://f.cloud.github.com/assets/2457670/1217293/42cc4896-26a2-11e3-8688-aaa072de226c.png)