Bootstrap 3.2.0, fixed some typo's, bower for client-side dependencies

Noticed some typo's (schoolen -> scholen) which I fixed. 
Also it is not recommended to keep 3rd party libraries in the repository, so I added bower as client-side dependency manager. 
Since the web interface is simple, I also upgraded to Bootstrap 3.2.0.

Last but not least I modified the README to include bower usage.