Improves start_shop, gets contacts ready for processing.

1) Slight improvements in UI with start_shop .. the date.
2) Adds deferred promise for contact.js.

js/shop.js

@@ -0,0 +1,31 @@
+$(function(){
+
+"use strict";
+
+// sensible defaults
+$("#shop_date").mask("0000-00-00", {placeholder: "yyyy-mm-dd" });
+
+
+// error handler for shops	with a popup dialog	
+	function error_handler(input,error_span,error,error_text,event) {		
+		var trans_error = 0;
+		if ( input == error ) {
+			if ( !error_span.is(":visible") ) {
+				error_span.show();		
+			}									
+			error_span.html(error_text);
+			trans_error = 1;
+		} else {
+			trans_error = 0;
+			error_span.hide();	
+		}						
+			
+		if (trans_error) {
+	   	event.preventDefault();
+		} 
+		
+		return trans_error;
+
+	} // end error_handling function
+
+});