Loading 3.1 runtime assemblies on 5.0 fails

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When multiple runtimes are installed on the Host:
2.1.811
3.1.404
5.0.100

And the host is configured to run as 3.1 application, then loading the System.Runtime 5.0.0 fails.
Expected behaviour: when the host is operating using the 3.1 runtime, the 3.1 runtime assemblies must be loaded, even though 5.0 assemblies are available on the host.

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Pull request created: #41

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Resolved in V 2.1.0