Use six to patch HTTPMessage so that it works on Python 2 and Python 3

setup.py

@@ -15,6 +15,9 @@ setup_params = dict(
 	url="https://bitbucket.org/jaraco/wolframalpha",
 	packages=setuptools.find_packages(),
 	zip_safe=False,
+	install_requires=[
+		'six',
+	],
 	setup_requires=[
 		'hgtools',
 		'pytest-runner',

wolframalpha/__init__.py

@@ -7,6 +7,10 @@ except ImportError:
 
 from xml.etree import ElementTree as etree
 
+from . import compat
+
+compat.fix_HTTPMessage()
+
 class Result(object):
     def __init__(self, stream):
         self.tree = etree.parse(stream)

wolframalpha/compat.py

@@ -0,0 +1,14 @@
+import six
+from six.moves import http_client
+
+def fix_HTTPMessage():
+	"""
+	Python 2 uses a deprecated method signature and doesn't provide the
+	forward compatibility.
+	Add it.
+	"""
+	if six.PY3:
+		return
+
+	http_client.HTTPMessage.get_content_type = http_client.HTTPMessage.gettype
+	http_client.HTTPMessage.get_param = http_client.HTTPMessage.getparam