Fixes BookTextParser

Fixes Bug #734 'Book empty line problem'
Hides buttons 'Next' and 'Prev' at the last and at the first page
Tag DIV is parsed for now

![- 02 05 2013 - 08 16 28](https://f.cloud.github.com/assets/467709/452331/3d95ab60-b2df-11e2-9124-02f549154295.png)
![- 02 05 2013 - 08 16 46](https://f.cloud.github.com/assets/467709/452332/3dd0dc8a-b2df-11e2-9dfb-2de321f80f06.png)
![- 02 05 2013 - 08 17 04](https://f.cloud.github.com/assets/467709/452333/3dcebb8a-b2df-11e2-9b77-3eb887a88e70.png)
![- 02 05 2013 - 08 17 18](https://f.cloud.github.com/assets/467709/452334/3dcefbae-b2df-11e2-9103-0540565210a9.png)