Remove UserGroup model
Remove UserGroup model

This model wasn't needed as it is a pivot table.

localheinz/opencfp,mdwheele/opencfp,opencfp/opencfp,GrUSP/opencfp,mdwheele/opencfp,localheinz/opencfp,PHPBenelux/opencfp,opencfp/opencfp,PHPBenelux/opencfp,localheinz/opencfp,mdwheele/opencfp,GrUSP/opencfp,localheinz/opencfp,GrUSP/opencfp,opencfp/opencfp,PHPBenelux/opencfp,mdwheele/opencfp,PHPBenelux/opencfp,GrUSP/opencfp