wrote tests for connection(); fix testImportRdfWithUrlAndRdfXml302After303GithubOntoWikiIssue101

But now there is an error in AppIntegrationTest.php:

1) Erfurt_AppIntegrationTest::testAuthenticateWithOpenIdWillFail
Array to string conversion

/var/www/erfurt/library/Erfurt/Cache/Frontend/QueryCache.php:171
/var/www/erfurt/library/Erfurt/Store.php:373
/var/www/erfurt/library/Erfurt/App.php:305
/var/www/erfurt/tests/integration/Erfurt/AppIntegrationTest.php:79