Improvement for detecting nopCommerce

1. Added Generator Meta
2. Added two cookies (.Nop.Customer and Nop.customer)

src/apps.json

@@ -10069,9 +10069,15 @@
 			"cats": [
 				"6"
 			],
+			"headers": {
+  			"Set-Cookie": "Nop\\.customer="
+       },
 			"html": "(?:<!--Powered by nopCommerce|Powered by: <a[^>]+nopcommerce)",
 			"icon": "nopCommerce.png",
 			"implies": "Microsoft ASP.NET",
+			"meta": {
+  			"generator": "^nopCommerce$"
+       },
 			"website": "http://www.nopcommerce.com"
 		},
 		"openEngine": {