Merge pull request #8 from Copper-Head/jsonio

Added JSON I/O
added (un)pickling functionality
rough translation
Merge pull request #9 from SameerSarkar/master

rough translation
fixed  variables in pickle_puf
added option of null planY
puf now dict read from pickle file, all dependent vars as keys
plan X vars now read from JSON
added puf update code and tested all dict lookups, they work
Merge branch 'pickling' of https://github.com/Copper-Head/taxcalc into params-dict
added length measurement to pickled object for subsequent referencing and added picked file to dir
removed picked puf due to its size and privacy concerns
Getting latest pickling code
removed unnecessary np.zeros calls, replaced tabs with spaces.
added some inline comments
can now serialize numpy arrays to json lists
translation now outputs json and uses json_io for all related operations