Added BinaryHeap class.
Finished AngularCache.put() using new BinaryHeaps. #28
Completed most of refactor using new BinaryHeaps. Started re-write of unit tests.
Finished the tests for `$angularCacheFactory`. #58
Added test files for BinaryHeap tests.
Finished the BinaryHeap tests. #51 #57 #58
Finished test for $angularCacheFactoryProvider. #51, #57, #58
Finished re-write of unit tests. #51, #57, #58
Merge pull request #57 from jmdobry/feature-heap-delete

Feature heap delete