Update configs to use 1.4.0 branches and code
update resources to use modern endpoints
WebMachine returns body for 415 now
Update to 1.4.0 integration branch

Yokozuna is now targeting the Riak 1.4.0 release.
Use RZ 1.4.0 integration branch
Use `get_state_partition` function

Since I opted not to take Eric's KV 1.4.0 integration branch I
switched back to using the temporary `get_state_partition` function.
This may go away once integrated with master, not sure yet.
Merge pull request #139 from basho/er-1.4.0-updates

Re-target Yokozuna to Riak 1.4.0