fix: to read the weights and bias from the VGG Mat file

[kklo]

dunno if the ordering of scipy.io.loadmat(path) is machine dependent or not. Here is what I have changed to make it runs on my machine.

[log0]

This merge will break a series of other clients. Can you add a logic to detect that instead?

[jianchao-li]

According to this issue, it is enough to change the link to the VGG-19 model in README.md from

You will need to download the [VGG-19 model](http://www.vlfeat.org/matconvnet/models/imagenet-vgg-verydeep-19.mat).

to be

You will need to download the [VGG-19 model](https://drive.google.com/file/d/0B8QJdgMvQDrVU2cyZjFKU1RrLUU/view?usp=sharing).