* re-enable error handling in create_node results. * add subscribe_to_node method. * subscribe to all nodes created.
* re-enable error handling in create_node results.
* add subscribe_to_node method.
* subscribe to all nodes created.

dreibh/planetlab-lxc-plcapi,dreibh/planetlab-lxc-plcapi,dreibh/planetlab-lxc-plcapi,dreibh/planetlab-lxc-plcapi