Initial commit of Ansible support for the Consul clustering framework (http://consul.io).

Submission includes support for
 - creating and registering services and checks
 - reading, writing and lookup for values in consul's kv store
 - creating and manipulating sessions for distributed locking on values in the kv
 - creating and manipulating ACLs for restricting access to the kv store
 - inventory support that reads the Consul catalog and group nodes according to
     - datacenters
     - exposed services
     - service availability
     - arbitrary groupings from the kv store

This submission makes extensive use of the python-consul library and this is required
as a dependency and can be installed from pip.

The tests were written to target a vagrant cluster which can be setup by following the
instructions here http://github.com/sgargan/consul-vagrant

test/integration/consul_running.py

@@ -0,0 +1,11 @@
+''' Checks that the consul agent is running locally. '''
+
+if __name__ == '__main__':
+
+    try:
+        import consul
+        consul = consul.Consul(host='0.0.0.0', port=8500)
+        consul.catalog.nodes()
+        print "True"
+    except:
+        pass