Fix spelling error, and add uWSGI stats server support.

Nick Bimpasis found a spelling error with our README.md file, which this
change request fixes. I've also added support the the uWSGI stats server,
which is required to provide New Relic support for uWSGI monitoring.

Change-Id: Ie545581f9aa7c5a277336c71e56c5350fc47493f
Merge "Fix spelling error, and add uWSGI stats server support."