added btypes_eqc to test bucket types creation invariants

the test does not yet cover crashing and chaning the claimant or waiting for
type properties to propogate to other nodes (for that we will probably need/use riak_test).
However, it does reproduce #442
validate riak_core properties that were added as part of by bucket types

addresses #442
Merge pull request #460 from basho/jrw-btype-prop-validation

Validate Bucket Type Properties Required by Core