updated tests for clarity

removed one test case in data store, as we don’t
actually assign a .cache property onto the data
store
CacheHandler tests

trying to debug some caching issues
collection result test - is a failing case
rewrite the cache handler put to support all cases

move test cases from data store to cache handler file
cache expanded resources in collections
Merge pull request #135 from stormpath/cache-fixes

Cache fixes for collection items and expansions