move srng into noise layers, seed from numpy
move srng into noise layers, seed from numpy

MihailoIsakov/fishfish,mheilman/Lasagne,kracwarlock/Lasagne,ErnstHowie/Lasagne,rlkelly/Lasagne,Richi91/nntools,gabortakacs/Lasagne,cancan101/Lasagne,DeanChan/Lasagne,ebattenberg/Lasagne