Features/ckimage uploader

@donaier 

A few thins to consider before being shocked by sloppyness in this feature branch:
(no specs,  ugly css, disabled CSRF)

- We usually do not want customers to include images with inline styling, as this breaks our nice responsive designs: this feature will be disabled in 90% of our apps

- we have a pending backend views rewrite

That's enough excuses i guess ;)