Changes to Switchboard s5 recipe.. done more data preparation.

egs/swbd/s5/cmd.sh

egs/swbd/s5/conf/mfcc.conf

egs/swbd/s5/conf/topo.proto

egs/swbd/s5/local/eval2000_data_prep.sh

egs/swbd/s5/local/swbd_map_words.pl

egs/swbd/s5/local/swbd_p1_data_prep.sh

egs/swbd/s5/local/swbd_p1_format_data.sh

egs/swbd/s5/local/swbd_p1_prepare_dict.sh

egs/swbd/s5/local/swbd_p1_train_lms.sh

egs/swbd/s5/path.sh

egs/swbd/s5/run.sh

egs/swbd/s5/steps

egs/swbd/s5/utils