Add vext.pygtk to tox to attempt pygtk warning fix.

pygtk.vext

@@ -0,0 +1,26 @@
+# Pygtk vext
+#
+
+# Vext will allow access to these modules
+modules:
+    cairo
+    gtk
+    pygtk
+    glib
+    gobject
+    gtksourceview2
+
+test_import:
+    # Vext will try and import any modules here
+    # To check if the install worked
+    gtk, pygtk
+
+# move glib and gobject to their own vexts
+
+# pygtk.pth does most of the initialisation of pygtk
+pths:
+    pygtk.pth
+
+
+install_hints:
+PyGTK was not found, install it in your system python.

tox.ini

@@ -1,8 +1,12 @@
 [tox]
-envlist = py27,py33,py34,py35,py36
+envlist = py27
 
 [testenv]
+sitepackages=True
 deps =
-    nose >= 0.10.4
-    coverage
-commands = nosetests --with-coverage
+  vext.pygtk
+  nose >= 0.10.4
+  coverage
+commands =
+  nosetests --with-coverage \
+        []        # substitute with tox' positional arguments