add common types and classes

dns.classes.js

@@ -0,0 +1,9 @@
+(function (exports) {
+'use strict';
+
+exports.DNS_CLASSES = {
+  IN:   0x01  //   1
+, ANY:  0xff  // 255
+};
+
+}('undefined' !== typeof window ? window : exports));

dns.types.js

@@ -0,0 +1,17 @@
+(function (exports) {
+'use strict';
+
+exports.DNS_TYPES = {
+  A: 			0x01	//   1
+, NS: 		0x02  //   2
+, CNAME: 	0x05  //   5
+, SOA: 		0x06  //   6
+, PTR: 		0x0c  //  12
+, MX: 		0x0f	//  15
+, TXT: 		0x10  //  16
+, AAAA: 	0x16  //  28
+, SRV: 		0x21  //  33
+, ANY: 		0xff  // 255
+};
+
+}('undefined' !== typeof window ? window : exports));