Need to add interfaces for I2C support

Hey,
Im having some problems while using your libraries to manage gpio on mi rb pi 3 from my aspnet webapi core 2. When calling GpioController.Instance an error ocurred:

### fail: Microsoft.AspNetCore.Server.Kestrel[13]
Connection id "0HLB05C1JH9C2", Request id "0HLB05C1JH9C2:00000001": An unhandled exception was thrown by the application.
System.Exception: Could not find device path for Windows application ---> System.InvalidOperationException: Sequence contains no matching element
at System.Linq.Enumerable.Single[TSource](IEnumerable1 source, Func2 predicate)
at Bifrost.Devices.Gpio.GpioController.get_Instance() in C:\Users\alejandro\Documents\Visual Studio 2017\Projects\HomeApplication\Bifrost.Devices.Gpio\GpioController.cs:line 35
--- End of inner exception stack trace ---
at Bifrost.Devices.Gpio.GpioController.get_Instance() in C:\Users\alejandro\Documents\Visual Studio 2017\Projects\HomeApplication\Bifrost.Devices.Gpio\GpioController.cs:line 43

I obtained this error changing the references from nuget straight to your projects downloaded. Trying to figure it out, but probably you could be faster than me. Thanks in advance, let you know if i find smth.

Hi!
First of all thanks for making this lib open, learned a bunch from your code and your blog posts.
I was having an issue with opening/writing pins.
Looks like the bridge is reading files from 'DefaultAccount', but I was running an app with my 'administrator' account (note lowercase a at the start), so it is writing to administrator/Packages
Line 29 in GPioController is doing the replacement for 'Administrator'. Maybe lowercase comparation is needed here

(Running a Pi 2 B with Win 10.0.15063.0)

Thanks!

Regards,
Diego