Restore Python 2.5 and 2.6?

(This commit was 'push --force'd)

.travis.yml

@@ -3,5 +3,5 @@ python:
   - "2.7"
   - "2.6"
   - "2.5"
-install: if [ "$(python --version 2>&1)" == "Python 2.5.6" ]; then pip install -r python25-requirements.txt --use-mirrors; fi
+install: if [ "$(python --version 2>&1)" == "Python 2.5.6" ]; then pip install -r python25-requirements.txt --use-mirrors; fi; if [ "$(python --version 2>&1)" == "Python 2.6.8" ]; then pip install -r python26-requirements.txt --use-mirrors; fi
 script: python ./setup.py test

github/tests/__init__.py

@@ -11,10 +11,20 @@
 
 # You should have received a copy of the GNU Lesser General Public License along with PyGithub.  If not, see <http://www.gnu.org/licenses/>.
 
-import unittest
+import sys
+
+atLeastPython27 = sys.hexversion >= 0x02070000
+
+if atLeastPython27:
+    import unittest
+else:  # pragma no cover
+    import unittest2 as unittest  # pragma no cover
 
 import AllTests
 
 
 def run():
-    return unittest.main(module=AllTests, argv=["Dummy Script Name"], exit=False).result
+    testLoader = unittest.loader.TestLoader()
+    testRunner = unittest.runner.TextTestRunner(verbosity=1)
+    test = testLoader.loadTestsFromModule(AllTests)
+    return testRunner.run(test)

python25-requirements.txt

@@ -1 +1,2 @@
 simplejson
+unittest2

python26-requirements.txt

@@ -0,0 +1 @@
+unittest2