Fix itext rendering

Work in progress.
First line fixe and text background color fix.
moved one property from itext to text.

Current iText Drawing, showing BackGroundColor, TextBackgroundColor, selection behaviour
![immagine](https://cloud.githubusercontent.com/assets/1194048/5154382/e8725cf0-7259-11e4-8025-d9daa88e7eb9.png)

This is how it looks like with those fixes
![immagine](https://cloud.githubusercontent.com/assets/1194048/5154460/0ac081d8-725f-11e4-8b5b-24af98c7cf0d.png)

Stil toSvg to be updated to reflect.
Also, cursor position should be lovered a bit in my opinion, and maxHeight should be calculated better, because in the first line of itext it looks like it is failing