created tag 0.5.0

Update dependecies and coding style fixes

Update changelog and cs fixes

Prepare for next release

Increase iterations number in Backpropagation test (sometimes it fails)

Merge pull request #16 from php-ai/develop

Simple Neural Network with MultilayerPerceptron and Backpropagation

Merge pull request #12 from php-ai/develop

New features: ClassificationReport and FileDataset

Merge pull request #9 from php-ai/develop

Add missing docs and create changelog

remove hhvm from travis