Merge remote-tracking branch 'upstream/master' into shortcut

.gitignore

egs/swbd/s5c/local/chain/tuning/run_blstm_6j.sh

egs/swbd/s5c/local/chain/tuning/run_lstm_6j.sh

egs/swbd/s5c/local/chain/tuning/run_tdnn_7g.sh

egs/swbd/s5c/local/chain/tuning/run_tdnn_7h.sh

egs/swbd/s5c/local/chain/tuning/run_tdnn_7i.sh

egs/swbd/s5c/local/chain/tuning/run_tdnn_7j.sh

egs/swbd/s5c/local/chain/tuning/run_tdnn_7l.sh

egs/swbd/s5c/local/chain/tuning/run_tdnn_lstm_1a.sh

egs/swbd/s5c/local/chain/tuning/run_tdnn_lstm_1b.sh

egs/swbd/s5c/local/chain/tuning/run_tdnn_lstm_1c.sh

egs/wsj/s5/steps/nnet3/tdnn/train_raw_nnet.sh

src/Doxyfile

src/doc/README

src/doc/dependencies.dox

src/doc/dnn3.dox

src/doc/dnn3_code_compilation.dox

src/doc/dnn3_code_optimization.dox

src/doc/dnn3_scripts_context.dox

src/doc/get_version_info.sh