WeightsSet.sparsify: skip if Tensor.length small.
Properly capitalize WordNet.scala filename.

--HG--
rename : src/main/scala/cc/factorie/app/nlp/wordnet/wordnet.scala => src/main/scala/cc/factorie/app/nlp/wordnet/WordNet.scala
ParseBasedMention: Property list prereqAttrs and postAttrs.
Further work on default methods for loading models and resources, based on URLs and System Properties.
ClasspathURLStreamHandler: Greatly enhanced to handle System Property substitutions.  Not yet cleaned up, though.
Get sparse de/serialization working in NER1.  SparseIndexedTensor.dot faster due to starting search from prevous position.
Merge.
util: a hyperparameter optimizer, supporting qsub and ssh backends
merge