Removed runtimes section from project.json, was necessary to get VS
to build. Added <CopyNuGetImplementations> to csproj instead.

dotnet cli build works now, but VS doesn't copy dependent DLLs...
Wait for official RC2 release with VS support.

Project now compiles under VS2015

Note that no tests have been executed and the provider is probably still
broken in some ways (this is just a first step).

Fixes #17

From commit bb43e2282fb13b0deb931d199c95d07ab84169a0.
Project does not compile.