Fix Graphite installation directory creation

There is a bug with pip and the way the Graphite package is setup that
causes webapp directory not to be created.

graphite-project/graphite-web#1508

Author: dmichel1

roles/graphite/tasks/main.yml

@@ -21,7 +21,9 @@
 
 
 - name: Install Graphite from PIP
-  pip: requirements=/tmp/requirements.txt
+  pip:
+    requirements: /tmp/requirements.txt
+    extra_args: "--no-binary=:all:"
   environment:
     PYTHONPATH: "/opt/graphite/lib:/opt/graphite/webapp"