update travis.yml to handle multiprocessing
update travis.yml to handle multiprocessing

dedupeio/dedupe-examples,dedupeio/dedupe,01-/dedupe,pombredanne/dedupe,datamade/dedupe,neozhangthe1/dedupe,neozhangthe1/dedupe,davidkunio/dedupe,tfmorris/dedupe,dedupeio/dedupe,nmiranda/dedupe,01-/dedupe,davidkunio/dedupe,nmiranda/dedupe,pombredanne/dedupe,datamade/dedupe,tfmorris/dedupe