Implements #168 keeping decoding on GPU

IMPORTANT: Requires a custom build of nvpipe due to bug in nvpipe.

components/rgbd-sources/src/sources/stereovideo/stereovideo.cpp

@@ -244,6 +244,7 @@ bool StereoVideoSource::compute(int n, int b) {
 	} else {
 		//left.download(rgb_, stream_);
 		stream_.waitForCompletion();  // TODO:(Nick) Move to getFrames
+		LOG(INFO) << "NO SECOND CHANNEL: " << (bool)depth_.empty();
 		host_->notify(timestamp_, left, depth_);
 	}