Some updated examples pages using bootstrap v.3.3.0.rc.2 styles/examples

Hi!

I've added some more example pages based on bootstrap 3 examples and generally have cleaned up some of the stuff that I left in the repo from the last pull request.  

I'm sure there could be some smart stuff done with .j2 templates when it comes to repetitive elements like columns -- but have not yet had time to figure this out.  Perhaps you could have a look and see what you think!  

Also, the offcanvas example is almost working, just need to do some debugging on the javascript to enable full functionality for small window sizes/small screens.  

I also updated the navbar and have enabled for a full-width jumbotron by through some small modifications.