libusbk WDF_Violation (BSoD) if device removed during UsbK_SetCurrentAlternateSetting

Travis,

I pulled together a minimal example which demonstrates this issue with my
device.  You can find the project at
https://github.com/mliberty1/libusbk_examples.  I also published a 0.1.0
release that is already built using Visual Studio 2013 for x64.

Thanks for your recommendation to isolate ISO streaming
from SetCurrentAlternateSetting.  Using this libusbk_examples
altsetting.exe, I have found that the WDF_Violation/BSoD occurs when just
calling SetCurrentAlternateSetting without starting any ISO streaming, and
it does not even need to be switching from an alternate setting that
contains an ISO IN endpoint.  I am able to replicate this fault very easily
on my Windows 8.1 x64 machine and on another Windows 7 x64 machine.  You
can view my device descriptor at:
https://github.com/mliberty1/libusbk_examples/blob/master/results/device1_descriptor.txt

The windbg output for the faults on the two machines are under:
https://github.com/mliberty1/libusbk_examples/tree/master/results

By default, running altsetting.exe will find the first alternate setting
with an isochronous IN endpoint and repeatedly switch between that
alternate setting and 0.  You can also explicitly specify a different
alternate setting like so:
altsetting.exe --altsetting 1

Hopefully you are able to replicate this result easily using another
device.  Please let me know if you have any questions or run into any
issues with the libusbk_examples project.  I likely will not have another
chance to spend significant time on this until Tuesday.  Unless you have
other recommendations, my next step will be to create a really stripped
down device with just two empty altsettings and see if I can still repeat
this failure.

Thanks and have a great weekend!

   - Matt

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