Refactored and created a test solution which has xunit installed and so on
Converted exisiting functional tests into xunit functional tests so that it can be run using the test framework
Added RunTests.ps1 to run from TeamCity
Fix Newtonsoft.Json package reference
Simplified MetricsTests.cs
Merge pull request #10 from NuGet/daravind/FunctionalTests

Functional Tests for Metrics Service as part of CI