bump to django-reversion 1.4 so this is consistent with the rest of A…

…rmstrong

package.json

@@ -4,7 +4,7 @@
     "description": "Provides the basic well objects",
     "install_requires": [
         "django==1.3.1",
-        "django-reversion==1.3.3",
+        "django-reversion==1.4.0",
         "armstrong.hatband>=1.1.0,<1.2"
     ]
 }