adding ConfigClassName() for loading classes
loading of class for transport
Revert "adding ConfigClassName() for loading classes"

This reverts commit d37529a6ca1c391c847e19e73dd217825dee3702.
Might be useful some day but not for this feature.
allow TxRiakManager to set the transport class as well
stop using class names, now with tests
explicit unpacking for RiakClient
explicit unpacking for txriak manager
using test. as bucket_prefix
Merge branch 'feature/issue-469-riak-manager-transport-class' into develop