Add crdt high level itest and fix low level itest
Fixes #362
crdt itests now require -Dcom.basho.riak.crdt

These tests were running by default without having defined
-Dcom.basho.riak.crdt=true.

That said, they also were hanging when that was the case, which is an issue
that needs to be investigated. I will open a sperate issue for that.
Merge pull request #363 from basho/gh362-fix-crdt-itest

Add crdt high level itest and fix low level itest