fixed Model::save()
small simplification
fixed some typos in the readme
Merge pull request #31 from jdreesen/fixes

Some fixes
added way to retrieve a cursor from a cursor list so that sprinkles can be used together with other APIs
fixed bug introduces in latest refactor causing primary keys to be set mutiple times
added lots of test stubs
test implementations. Most tests fail because of problems with roboelectric
fixed indentation
updates roboelectric version to get tests to run.
refactored so test models are declared inside each test scope
added test stubs for content resolver notifications
tested content ntifications
test cascade delete