[ci skip] code cleanup
[ci skip] contenthub adapted to newest release (now matching the version that is running on the demo server
[ci skip] manual merge
[ci skip] manual merge
Merge remote-tracking branch 'upstream/master'
[ci skip] contenthub allows now for search; authentication for contenthub methods integrated
[ci skip] added unit test for the new contenthub/search/featured functionality.
[ci skip] added sample api_keys file for configuration of Stanbol tests.
[ci skip] authentication for all methods, via global variable to be set in api_keys.js file. Exceptions, for which authentication is still commented out (because it is seemingly not provided yet in Stanbol) are ontoScopes(), lookup(), referenced(), and createSession().
Merge pull request #12 from mere01/master

authentication with Stanbol server added