because each cdn deals with how it stores compressed and uncompressed code(or whether it stores it at all - we must allow the user to specify 
1. the production version of the script
2, the debug version of the script.
Hence I allowed the declaration of both in configuration.  Leaving it blank means we will use the production version during debugging,
the COM_CONFIG_FIELD_CDN_JQUERYURID_LABEL is the label for the jQueryURI param for debugging... line  52 COM_CONFIG_FIELD_CDN_JQUERYURID_DESC  is the description for the same parameter.