added HTTP client Guzzle as dependency (#28)
added API client stub (#28)
removed group as the test helper is not a TestCase
added test case stub (#28)
refactoring: extracted method (#28)
improved documentation (#28)
documented container type (#28)
added stub for Stardog test helper (#28)
implemented Stardog test helper; uses the container adapter factory (#28)
added service definition for Stardog API client (#28)
added database option (#28)
added test (#28)
fixed factory configuration (#28)
configured database as default parameter (#28)
fixed name of base_url parameter (#28)
configured authentication (#28)
fixed return value of size() (#28)
added curl configuration (#28)
defined more operations; activated error plugin to improve information in case of failure (#28)
added custom error listener to avoid exception in case of 20x responses (#28)