* Added a xib for my tweet cell.
* Added auto layout stuff for it.
* Added dynamic cell height calculations.
* Started fetching retina profile images in timelines for retina displays.
* We don’t fetch tweets for peers everytime we open their tweet list. We simply fetch them periodically from opening them the first time (till the app exits).
* Everything is stored to Core Data. NSInMemoryStore behaves weirdly. I have to figure out why it purges my data :-O
* Added back my segue. I wonder why the segue got broken.
* Fixed the initialisation for TweeterUser.