Scale bitmap based on density of screen

Moved a lot of the setup code to its own function in the AdCreationManager. I'm not sure if this was the best decision since I wanted to keep it free from dealing with views, but I was literally copying and pasting code in all the activities. If anyone has a better suggestion let me know. In any case <code>AdCreationManager::setup</code> is where all the common setup code lies.

The logoview still needs some love. Not entirely sure how to get that one working yet.