PR3031 Enhance support for Windows 2008 server over remote desktop 

I will just repeat what I stated in Issue 3031:

I can run my monogame program on several windows 7 and XP, without any trouble.
When I try to run it on Windows 2008R2 Server accessed via remote desktop/spice (I have reproduced it on two virtual machines, one of them just installed and updated) it fails with exception:

Unhandled Exception: SharpDX.SharpDXException: HRESULT: [0x887A0004], Module: [Unknown], ApiCode: [Unknown/Unknown], Message: Unknown
at SharpDX.Result.CheckError()
at SharpDX.Direct3D11.Device.GetSupportedFeatureLevel()
at Microsoft.Xna.Framework.Graphics.GraphicsDevice.PlatformGetHighestSupportedGraphicsProfile(GraphicsDevice graphicsDevice) in c:\MinGW\msys\1.0\home\nologin\monogame\MonoGame\MonoGame.Framework\Graphics\GraphicsDevice.DirectX.cs:line 1237
at Microsoft.Xna.Framework.GraphicsDeviceManager..ctor(Game game) in c:\MinGW\msys\1.0\home\nologin\monogame\MonoGame\MonoGame.Framework\GraphicsDeviceManager.cs:line 67
at myPackage.myGame..ctor() in c:\ [...] \myGame.cs:line 123

According to http://msdn.microsoft.com/en-us/library/windows/desktop/bb509553%28v=vs.85%29.aspx
that exception means:
DXGI_ERROR_UNSUPPORTED 0x887A0004 The requested functionality is not supported by the device or the driver.

Debugging monogame, I have also found that on the 2008 machine I can´t create a GrapchicsDevice with DriverType.Hardware (Reference and Warp drivers are ok), or with any FeatureLevel (not even 9_1).

I want to be able to run the program on windows 2008 server boxes, which needs the following corrections:

- Let the program run, although GetSupportedFeatureLevel() fails.
- Let the programmer choose the driver type (not only Reference driver, as it is supported now, but Warp too, which is faster)
- Check for supported FeatureLevels before requesting them, and if they are not supported, do not request them to the SharpDX.Direct3D11.Device constructor

------------------------
By the way, the UseReferenceDevice that I replace with UseD3DDriverType, has not made its way to  stable yet.
My code is extending the functionality of UseRerenceDevice, which is DirectX-only, so I intentionally made it look DirectX dependent. The code only is effective on a DirectX backend. I don´t know if iOS, android, etc. have the concept of "driver" as DirectX do.
Anyway I have applied the change you suggest, as you know monogame much better than me.