tedlium,nnet1: updating according to Eric Rieblings suggestions



git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@4519 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8
trunk: small changes in egs/librispeech

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@4520 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8
trunk: fixing a small problem introduced by the previous commit

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@4521 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8