Match case when retrieving appendToStream.js via Resources

[searbe]

It took a while to get back around to this - only just got around to spinning up a real CosmosDB instance. The resource name needs to match filename's case too - tests against a real CosmosDB instance will fail without this.

Hope this didn't cause any headaches - although I suppose not on case-insensitive file systems. Do you make use of this project in production at ASOS?

Now it builds and, crucially, all the tests pass on Ubuntu 🚀 🐧

(This is only true for the netcoreapp2.0 tests - the net452 tests via mono will fail at runtime due to issue #7410 since DefaultTrace from Microsoft.Azure.DocumentDb is hard-coupled with EventProviderTraceListener.)

[asosMikeGore]

Thanks for the PR. I am looking to drop support for net452 but waiting on feedback from our internal consumers, once this is done I am looking to see if we can get this building on Linux build agents.

We do make use of this project in a number of different services, but this is being used in Windows environments only which is why this hasn't been picked up.