Merge pull request #92 from markhuberty/patstat

Provide Jaccard and Haversine comparators and move comparator modules to own directory.
add nan to haversine, fixed path in patent_example
improving haversine and adding tests
fixed path:
fixed more paths for affine gap
created training_serializer to handle tuples and frozensets in training json
added class variables for training_encoder and training_decoder
import simplejson if json does not have right module, move latlong and set into base api
python version conditional requirements install