Handle json data, convert test data. Example:

mkdir json
bin/import-data src/encoded/tests/data/inserts/ production.ini --outputdir json
Make conversion a separate command.
Merge branch 'master' into refactor-test-data
Script tweaks
Convert tsv test data to json
Update tests to use json data.
Merge pull request #180 from ENCODE-DCC/refactor-test-data

Refactor test data