Rename all occurrences of "PTB" to "Penn".  (Easier to pronounce.)
Rename all "DiscreteTensor*" to "Vector*" and "CategoricalTensor*" to
"CategoricalVector*".  (The values are required to be Tensor1 anyway,
and this name is less confusing.  We have been discussing this change
for some time.)
Change source file names to match previous commit regarding
"DiscreteTensor*" -> "Vector*".
Merge branch 'master' of git@github.com:factorie/factorie.git
Add comments.
NLP Document: new owplString method taking DocumentAnnotator.
Tokenizer1: Patterns for "No." abbreviation, and better separation of
date pattern.
TokenNormalizer: Fix normalization of quotes.