Please add facade for jsnlog and StackTraceJS to list of facades

[bwbecker]

Please see https://github.com/bwbecker/jsnlog-facade for a facade of the jsnlog logging library. It

• facilitates logging to the browser console as well as the server
• includes an enrichment to make logging exceptions easy, including stack traces with the Scala file references if the source maps are available.
• includes a facade for StackTraceJS to accommodate the stacktraces in the above point.
• includes a demo that shows logging exceptions with the onerror handler as well as a logging execution context to catch exceptions thrown in futures.