fixed headlines in readme

added functionality to only send the current configuration if the out…

…put status changed (configurable);

the status will not be published every time the configuration changes. This is only needed if more than one module controls the strip. If needed the publishing can be reactivated with a configuration switch.

updated the WS2801 wiring plan

changed output topic to switch on with "on" message, off with "off" m…

…essage and toggle with each other message