preparing 0.2-Release, fixing mathjax-live-preview in ck-mathjax module.

Fixes:
- MathJax Formula Editor has "Live-Preview"
- Migration3 had the wrong number in its name
  last revision was therefore "broken" in repo :/i
- updated README

Code- Changes:
- fixed 1 var declaration of _this
- introduced whitespace behind function
- added some return statements

Pending:
- current layout currently does explicitly not support IE9, IE10 and Opera

Documentation:
https://www.eduzen.tu-berlin.de/software-komponenten (German)
https://www.eduzen.tu-berlin.de/zur-notizen-webanwendung (German / Get User Account)