Add support for send_start and send_stop from UI

* Add API endpoints to support send_start and send_stop
* Adding some tests for send_start and send_stop
* Start using NODE_ENV instead of a manual development flag
* Put a 'command-repeater' class on a command if the config file says it's a repeater
* Include sample config files, roll all config logic into env test
* Overhauling README
* Rev to 0.0.7