Incompatibility of documentation and API

[Filip Balak]

Request URLs for gluster volume creation via API are not same as URLs specified in documentation [1].
For example currently works
POST /:cluster_id/GlusterCreateVolume
instead of
POST /cluster/:cluster_id/volume/create
Json data that is sent to API in POST requests is also different.
Either the documentation or API implementation should be corrected.

[1] https://github.com/Tendrl/documentation/blob/master/api/gluster-create-volume-example.adoc