trunk: merging sandbox/dan back to trunk.  Includes addition of recipe for the LibriSpeech corpus, and the capability to rescore lattices using ARPA language models that are too big to convert into FSTs.

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@4504 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8
trunk: remove un-needed 'typename' from new const-arpa-lm code.

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@4509 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8
trunk: minor compilation-related fixes to the new large LM rescoring code

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@4510 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8
Added tags
Reset nnet-component.cc to original
master: Cleaned up .gitignore