code: function unique( target, arrays )
  {
  	target = target || [];
  	var combined = target.concat( arrays );
  		target 	 = [];
  
  	var len = combined.length,
  		i = -1,
  		ObjRef;
  
  		while(++i < len) {
  			ObjRef = combined[ i ];
  			if( target.indexOf( ObjRef ) === -1 && ObjRef !== '' & ObjRef !==  (null || undefined) ) {
  				target[ target.length ] = ObjRef;
  			}
  		}
  		return target;
  }
docs: join two arrays and prevent duplication
  @param  {array} target
  @param  {array} arrays
  @return {array}