Update to Version 2.0.2

This is an important bugfix release because 2.0.1 stopped working recently.

Changes:
* **IMPORTANT:** Made compatible with the new cmxlgy page structure #19
* Fixed bug that could cause broken zips and cbz files #16
* Updated zip library
* Fixed UI bug, that could cause wrong button sizes and alignment
* Code refactoring. Now checked against JSHint.

RC2 is still being tested. This request will be merged as soon as possible.