added Jurgen Schmidhuber's book to the list

Jurgen Schmidhuber and his students influenced a lot the field, mainly with LSTMs and winning competitions with deep convents. I believe his perspective on the subject should be highly considered.

README.md

@@ -6,6 +6,7 @@
 4.  [Deep Learning Tutorial](http://deeplearning.net/tutorial/deeplearning.pdf) by LISA lab, University of Montreal (Jan 6 2015)
 5.  [An introduction to genetic algorithms](https://svn-d1.mpi-inf.mpg.de/AG1/MultiCoreLab/papers/ebook-fuzzy-mitchell-99.pdf)
 6.  [Artificial Intelligence: A Modern Approach](http://aima.cs.berkeley.edu/)
+7.  [Deep Learning in Neural Networks: An Overview](http://arxiv.org/pdf/1404.7828v4.pdf)
  
 ### Courses