title: NUnit Unit tests not showing in Test Explorer with Test Adapter installed
body: <p>I've installed NUnit Test Adapter for VS2012 + 2013.  When I first installed the Adapter tests were showing up, but they stopped showing up for some reason today.  After building, rebuilding, cleaning, restarting, nothing shows up in Test Explorer.  Why would this be happening?  I'm using VS2013 Ultimate.</p>