Bugfix: incorect URN addresses used for config.xml and system.xml

[johnhughes1984]

urn:magento:framework:Config:etc/system_file.xsd should be urn:magento:module:Magento_Config:etc/system_file.xsd

urn:magento:framework:Config:etc/config.xsd should be urn:magento:module:Magento_Store:etc/config.xsd

[rhoerr]

Fixed by #9