Test with taggit 0.12.3

tox.ini

@@ -4,7 +4,7 @@ base =
     django-libsass>=0.2
     libsass==0.5.1
     django-modelcluster>=0.5
-    django-taggit==0.12.1
+    django-taggit==0.12.3
     django-treebeard==3.0
     Pillow>=2.3.0
     beautifulsoup4>=4.3.2
@@ -28,7 +28,6 @@ dj171 =
 
 dj18 =
     https://github.com/django/django/archive/stable/1.8.x.zip#egg=django
-    https://github.com/alex/django-taggit/archive/develop.zip#egg=django-taggit
 
 py2 =
     unicodecsv>=0.9.4