Renamed urlfetch adapter test and made it import unittest2 if v2.6

Author: jpatel531

.travis.yml

@@ -10,4 +10,5 @@ install:
   - "pip install aiohttp"
   - "pip install tornado"
   - "pip install urlfetch"
+  - if [[ $TRAVIS_PYTHON_VERSION == '2.6' ]]; then pip install unittest2; fi
 script: "python setup.py test"

pusher_tests/urlfetch_adapter_test.py renamed to pusher_tests/test_urlfetch_adapter.py

@@ -3,10 +3,14 @@
 from __future__ import print_function, absolute_import, division
 
 import pusher
-import unittest
 import httpretty
 import sys
 
+if (sys.version_info < (2,7)):
+  import unittest2 as unittest
+else:
+  import unittest
+
 @unittest.skipIf(sys.version_info >= (3,), "skip")
 class TestURLFetchBackend(unittest.TestCase):