Merge pull request #81 from benadida/update-to-django-1.4-latest

update django to 1.4.18

requirements.txt

-Django==1.4.5
+Django==1.4.18
 South==0.8.2
 anyjson==0.3.1
 celery==3.0.16
@@ -23,4 +23,4 @@ bleach==1.4
 boto==2.27.0
 django-ses==0.6.0
 validate_email==1.2
-oauth2client==1.2
\ No newline at end of file
+oauth2client==1.2