Fixed an error with Auth URL composition in Oauth2
Adding custom Credentials serialization/unserialization
Fixed ServiceBase methods in accordance to custom Credentials serial-n/unserial-n
Fixed NOT NULL for "credentials" in schema definition. Credentials may be null.
Removing double-serialization defined in schema
Merge branch 'fix/better-credentials-serialization' into feature/unit-testing
ServiceBase::$_service -> ::$name
Renaming tables
changed 'credentials' fields default to NULL
Removed unused wconsumer_ui.test
introduce Wconsumer class instead of Service
Removing unused Tests class
Removing unused argument from *_wconsumer_config()
Authentication\Base::$_instance -> ::$service
use requireCredentials and requireServiceCredentials instead of getCredentials and getServiceCredentials when credentials required
AuthInterface::signRequest() require Guzzle\Http\Client as $client parameter
Merge branch 'feature/unit-testing' into develop