Merge in pbourke's code

[GoogleCodeExporter]

Paul Bourke extended the MTController code to handle single-finger drags, as 
well creating a couple of new generic canvas object classes:

git://github.com/brk3/android-multitouch-controller.git

I think a couple of changes need to be made before merging (see my comments in 
the current MultiTouchController.java hosted here), but this is a useful 
capability.

Original issue reported on code.google.com by luke.hutch on 22 Apr 2012 at 4:57