Activity-based Rewrite and Lollipop Transitions

Boy, getting Lollipop transitions to work was hard work. I first tried it with fragments which almost killed me twice. Then I decided to switch to an activity-based app structure which was a lot of work, too, but worthwhile! This version thus includes:

• Better code structure
• Lollipop transitions
• Various crashes fixed
• Usability improvements

Too lazy to attach animated gifs of the transitions, install the app to see them ;).