Merge pull request #6 from jonludlam/events

Add the event helper modules.
Merge branch 'master' of github.com:jonludlam/xen-api-client
Update to use rpclib rather than a bespoke xmlrpc lib

Signed-off-by: Jon Ludlam <jonathan.ludlam@eu.citrix.com>
Merge pull request #1 from jonludlam/rpclib

Update to use rpclib rather than a bespoke xmlrpc lib