Enhanced debugging features:

[kshartman]

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1. Log request uri in server request handler for log level debug. I prefer to log this level info in mny fork because it enables quick diagnosis when my Alexa speech skill has misheard what I said. But doing it on debug level is more consistent with the original program.

2. Add /loglevel get request which implements ability to change the process NODE_LOG_LEVEL (one of trace, debug, info, warn, or error (and off which is a synonym for error)). Document the command in static doc content.

This is very useful when the code is running in a container. Especially if you add it to your alexa skill as I have.