Create some rule to initialize models

[muammar]

The biases are not correctly initialized. I should create some kind of trick to have them starting to values that make sense for the problem in question.

[muammar]

Fixed in 9bddd07.

[muammar]

I am reopening this issue after reading this article in medium:

https://medium.com/usf-msds/deep-learning-best-practices-1-weight-initialization-14e5c0295b94

Depending on the activation function used the weights have to be initialized differently.