feat(django1.9): Upgrade to django-taggit 0.17.5 (required for Django 1.9 compatibility)

setup.py

@@ -24,7 +24,7 @@ install_requires = [
     "Django>=1.7.1,<1.10",
     "django-compressor>=1.4",
     "django-modelcluster>=1.0",
-    "django-taggit>=0.13.0",
+    "django-taggit>=0.17.5",
     "django-treebeard==3.0",
     "djangorestframework>=3.1.3",
     "Pillow>=2.6.1",

tox.ini

@@ -21,7 +21,7 @@ basepython =
 deps =
     django-compressor>=1.4
     django-modelcluster>=1.1b1
-    django-taggit==0.13.0
+    django-taggit>=0.17.5
     django-treebeard==3.0
     django-sendfile==0.3.6
     djangorestframework==3.1.3