squeezenet model available

[jnorwood]

I tried a keras squeezenet 1.1 model from
https://github.com/wohlert/keras-squeezenet
and it only took a small mod to fix the _obtain_input_shape import and call (details in their issues) to be compatible with keras 2.2.2.

Maybe others would be interested in seeing this model in your collection. They have the h5 weights pretrained for imagenet 224 target size.