src: Code for Lattice forward backward to compute derivatives of conditional entropy is done. Not compiled yet.
Nnet discriminative unsupervised update and examples done. Not compiled.
Some minor bugs fixed
Merge branch 'LatEnt' of github.com:vimal-manohar91/kaldi-git into Uncertainty
Revert "Merge branch 'LatEnt' of github.com:vimal-manohar91/kaldi-git into Uncertainty"

This reverts commit 7bbba5848b60f5faa332622ad1ce43f0d202efa4, reversing
changes made to 37838a5e4a4ad69e1aa9b2267bbcd79f8adc4c1d.
Merge branch 'Uncertainty' of github.com:vimal-manohar91/kaldi-git into Uncertainty
Merge branch 'Uncertainty' of github.com:vimal-manohar91/kaldi-git into Uncertainty