Add rewrite rules for buckets and objects from OpenStack Object Storage API
Make rewrite module configurable
Add rewrite_module to list of options handled by riak_cs_sup
Start work on keystone auth module
Changes to riak_cs_wm_common to facilitate interaction with keystone auth module
Build out of keystone auth module with placeholder for actual communication with keystone service
Add token validation query to keystone auth module
Finish oos role check and add test for tenant_id function
Support for s3-style credentials when using keystone for authentication
Add create_user/4 function
Finish plumbing for creation of riak_cs user account for OS users