Initial resource to return all entity types in the system.
Add comment to get method.
Return workspaces names in GET call.
Add test for _all_dbs call.
Sort workspace arrays.
Rename files.
Adjust comments. Remove not needed use classes.
Merge pull request #10 from ygerasimov/2361449-all-dbs

Issue #2361449 by ygerasimov: Implement /_all_dbs.