ARC support and related fixes.

- Different animation modes. Default set to zoom.
- Class convenience methods (tadelv - http://github.com/tadelv).
- Autorotation when added to a UIWindow (wuf810 - http://github.com/wuf810).
- Extended demo app.
- Several smaller fixes.

Version 0.33

 - Custom view operation mode added.
 - Fixed a memory leak.

0.32 release.

Added minShowTime, graceTime, xOffset, yOffset. Various fixes.