Pull request

Hi!

here are some changes that I made for getting JCrop working in my wicket 6.7.0 project
and some minor stuff:

- upgraded to Wicket 6.7.0
- fixed css conflict with Bootstrap
- fixed some typos (methodnames, texts)

This is my first Git-experience and Pull-request, ever. So please instruct me, if something is wrong...

Greetings
Ralf
ralf.eichinger@gmail.com