#604 added a haproxy profile and wiki page
#609 refactored the load balancing code so we have a set of LoadBalancer implementations which are easier to use in a protocol/transport agnostic way
fixs #609 so you can easily configure the load balancer configuration for haproxy / http gateways
fixes #609 so we can configure the load balancer for the MQ gateway
 #609 use separate load balancer instances for when using stick load balancing between the ZK paths and the service URLs
 #609 initial documentation on how the gateway works and how ZooKeeper paths and URI templates let you map URIs to service implementations
 #609 added rolling upgrade docs
 #609 fixed typeo - thanks @davsclaus
make absolutely sure we don't leave a mapping rule in place during activation/deactivation
fixes #620 so servlets are mapped nicely
#620 added bundleName and bundleVersion to the URI template docs
fixes #621 so we can rewrite response header URLs from the back end URLs to the front end