trunk,nnet:minor changes to nnet components (<AddBias> <Rescale> are...

trunk,nnet:minor changes to nnet components (<AddBias> <Rescale> are trainable, <Copy> adding initialization)



git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@3409 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8