Highlights
* [Basic Iterative Method](https://foolbox.readthedocs.io/en/latest/modules/attacks/gradient.html#foolbox.attacks.BasicIterativeMethod) reimplemented (Linfinity, L1, L2)
* recommended instead of IterativeGradientAttack and IterativeGradientSignAttack
* [Projected Gradient Descent](https://foolbox.readthedocs.io/en/latest/modules/attacks/gradient.html#foolbox.attacks.ProjectedGradientDescent) attack (with and without random start)
* [Momentum Iterative Method](https://foolbox.readthedocs.io/en/latest/modules/attacks/gradient.html#foolbox.attacks.MomentumIterativeMethod)
* full PyTorch 0.4.0 support (thanks cjsg)
* new MXNetGluonModel wrapper for [Gluon models](https://gluon.mxnet.io) (thanks meissnereric)
Other improvements
* official PyTorch example in the docs
* bug fixes
* updated tests to use newer versions of the different frameworks
* improved documentation and fixed typos