Initial python3 changes

Mostly just updating libraries, removing string encoding/decoding,
fixing some edge cases. No new functionality was added in this
commit.

lib/pynma/pynma.py

@@ -5,12 +5,12 @@ from xml.dom.minidom import parseString
 try:
         from http.client import HTTPSConnection
 except ImportError:
-        from httplib import HTTPSConnection
+        from http.client import HTTPSConnection
 
 try:
         from urllib.parse import urlencode
 except ImportError:
-        from urllib import urlencode
+        from urllib.parse import urlencode
 
 __version__ = "1.0"