Tests fail when a PR is submitted by an external contributor

[jcansdale]

Errors, Failures and Warnings
1) Error : MetricsTests.Submissions.InvalidAppVersion
System.IO.FileLoadException : Could not load file or assembly 'GitHub.Exports, Version=2.5.1.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. A strongly-named assembly is required. (Exception from HRESULT: 0x80131044)
   at MetricsTests.Submissions.<InvalidAppVersion>d__6.MoveNext()
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[TStateMachine](TStateMachine& stateMachine)
   at MetricsTests.Submissions.InvalidAppVersion()
2) Error : MetricsTests.Submissions.ValidDimensions
System.IO.FileLoadException : Could not load file or assembly 'GitHub.Exports, Version=2.5.1.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. A strongly-named assembly is required. (Exception from HRESULT: 0x80131044)
   at MetricsTests.Submissions.<ValidDimensions>d__5.MoveNext()
   at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[TStateMachine](TStateMachine& stateMachine)
   at MetricsTests.Submissions.ValidDimensions()
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