install kaldi_lm tools

install_kaldi_lm.sh

 cd kaldi/tools || exit 1;
 if [ -d kaldi_lm ]; then
   echo Not installing the kaldi_lm toolkit since it is already there.
 else
   echo Downloading and installing the kaldi_lm tools
   if [ ! -f kaldi_lm.tar.gz ]; then
     wget http://www.danielpovey.com/files/kaldi/kaldi_lm.tar.gz || exit 1;
   fi
   tar -xvzf kaldi_lm.tar.gz || exit 1;
   cd kaldi_lm
   make || exit 1;
   echo Done making the kaldi_lm tools
 fi
) || exit 1;