Per object bake override

I've added additional "panel" that allows for overriding bake settings like:
* resolution
* target uv to which we should bake to

Also I fixed uv index detection.

![override_bake](https://f.cloud.github.com/assets/117785/349677/db3cabe6-9fdb-11e2-8b80-bdcacf69c92e.jpg)

Sorry for mess with indentations.