Tests for Configuration

fix #51 

created tests for yml and php configuration. All test are done for testing the setting of the default values, the multilang support of the default title and a full setting/changing of all values.
But i got a problem with the xml configuration I think i need to add the XSD file or the path somewhere, cause when i try to add a xml file to the test i get an error that the "cmf_seo" option is not supported or unknown.
I will have to add a schema test too.

@WouterJ do you have some hints for me and the xml configuration? The default_config.xml does exist, but if i try that i got an error.