eduZEN-Views extended about CKEditor 4.x with a custom MathJax integration.

The new mathjax-plugin is in early beta available at https://github.com/mukil/ck-mathjax

Repo now includes a custom build of the latest www.ckeditor.com as of yesterday.

Changes in the eduZEN-Views were:

- inline integration in the approach view (available to students)
- without any usability tweaks and without a TeX cheat sheet
- switched MathJax rendering to 'HTML-CSS' output option (mandatory from this commit on)

Basically working. To be tested in the wild.