Add ipwhois library + dependencies

lib/dns/_compat.py

@@ -0,0 +1,21 @@
+import sys
+
+
+if sys.version_info > (3,):
+    long = int
+    xrange = range
+else:
+    long = long
+    xrange = xrange
+
+# unicode / binary types
+if sys.version_info > (3,):
+    text_type = str
+    binary_type = bytes
+    string_types = (str,)
+    unichr = chr
+else:
+    text_type = unicode
+    binary_type = str
+    string_types = (basestring,)
+    unichr = unichr