Revert "found adagrad trick"

This reverts commit 3c239c825595e00919ede0e617a63bc21436b04e.

Conflicts:
	deeplearning4j-examples/src/main/java/org/deeplearning4j/example/mnist/RBMMnistExample.java
Revert "found adagrad trick"

This reverts commit 3c239c825595e00919ede0e617a63bc21436b04e.

Conflicts:
	deeplearning4j-examples/src/main/java/org/deeplearning4j/example/mnist/RBMMnistExample.java