Send back the operation status to client #29
Merged
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Currently, we only send back the status when there is an error. Here we should
follow the protocol
https://github.com/RobotWebTools/rosbridge_suite/blob/develop/ROSBRIDGE_PROTOCOL.md
Whatever the result is, we will return the status of the operation. 'level' equals to
'error' when error happens, 'level' equals to 'none' when the execution is successful.
Fix #26