Add engine light

Code for America utilizes an application called **Engine Light** to keep tabs on the health of an application. Here's an overview: http://engine-light.codeforamerica.org/

TL;DR: Every app needs a url engine light can hit and find out the status. The fields are:
* *status* ok or error
* *updated* UNIX timestamp, had to write one for .net
* *dependencies* 3rd party services used by the app
* *resources* resource usage information (percentage)