Improve documentation

Added feature section to README and improved install guide

Change-Id: Ib563f70145889173496cf43fbf83a9ad9d0897a2
diff --git a/doc/source/installation.rst b/doc/source/installation.rst
index 9bfe14e..b0a6f33 100644
--- a/doc/source/installation.rst
+++ b/doc/source/installation.rst
@@ -14,6 +14,11 @@
     $ mkvirtualenv patrole
     $ pip install patrole
 
+Or to install from the source::
+
+    $ navigate to patrole directory
+    $ pip install -e .
+
 Configuration Information
 #########################
 
@@ -44,6 +49,11 @@
 
        # The role that you want the RBAC tests to use for RBAC testing
        # This needs to be edited to run the test as a different role. 
-       rbac_role=_member_
+       rbac_test_role=_member_
+
+       # The list of roles that your system contains.
+       # This needs to be updated as new roles are added.
+       rbac_roles=admin,_member_
+
        # Tell standard RBAC test cases to run other wise it they are skipped.
        rbac_flag=true