Added new score types with score values of None
Support for new score types in Test.judge; added Test.check
Added in memory model run caching
Implemented caching by instance and by value
Added ability to catch errors at different levels of testing by placing the basic steps in _judge
Added more score types
Added capabilities that demonstrate cypy.memoize
Added model that demonstrates cypy.intern
Updated caching
Added from_observations class method to sciunit.TestSuite
Updated example IPython notebook
Fixed test example
Added Travis CI integration
Merge pull request #24 from rgerkin/master

New score types, beginning of caching, fixes, and Travis