Convert to Maven for easier builds, and make ARPA reader robust #28
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http://www1.icsi.berkeley.edu/Speech/docs/HTKBook3.2/node213_mn.html
specifies the ARPA LM format. In particular, there doesn't seem to be a requirement for tabs, and
in fact the CMU Sphinx LM files at http://sourceforge.net/projects/cmusphinx/files/Acoustic%20and%20Language%20Models/ don't use tabs to delimit the logprob and backoff weight from the ngram.
This change 1) converts the format of the project from Ant to Maven
and 2) rewrites nlp.lm.io/ArpaLmReader.java so that it's a bit shorter and reads all the files it used to, along with Sphinx (and I think, any other compliant ARPA) LM files.
the second more substantial change could probably be taken without taking the first build related one