Editing pull request to make sure that multiple requests don't lock to a single tenant.
Fixed "nugetted" MVC reference to be the same as plugin csproj.
Merge pull request #2 from davidwhitney/rschiefer-master

Integrate PR from @rschiefer with fixes.
Added test for new tenant property being correctly set in the FeatureEvaluator.
CachingFeaturesRepository now uses absolute cache expiries to prevent settings being cached forever.
Removed unnecessary web caching