Add a -c to wget so that it continues interrupted downloads

This would've saved me an overnight download (slow connection here)

I tested it, and it worked for me.

data/ilsvrc12/get_ilsvrc_aux.sh

@@ -12,7 +12,7 @@ cd $DIR
 
 echo "Downloading..."
 
-wget http://dl.caffe.berkeleyvision.org/caffe_ilsvrc12.tar.gz
+wget -c http://dl.caffe.berkeleyvision.org/caffe_ilsvrc12.tar.gz
 
 echo "Unzipping..."