Fixed -test_vMAT_load_float_55x57_v6_no_variables; it was using a stale resource name.
Fixed unused variable warning; this test suite could still use some work.
Fixed some misleading names and switched ClusterTests back to Objective-C (instead of Objective-C++).
Split API into multiple source files, grouped into an API folder.
Initial check-in of vMAT_coerce and vMAT_zeros functions.