Make ENCODE2-Mouse data public
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
Merge pull request #181 from ENCODE-DCC/encode2-mouse-public-1236

Make ENCODE2-Mouse data public
Currently no upgrades needed by default.
Use weak identity map to stop indexer process growing unboundedly
Item and key caching.
LRUCache for embedding too
Fix caching so it is properly cleared between top level requests.
Split up code of embed to make cache logic clearer.
manager.stack[0] *is* the top level request
Increase cache capacity.
Python package versions update.
Merge pull request #182 from ENCODE-DCC/python-update

Python package versions update.
Merge pull request #183 from ENCODE-DCC/better-caching

Better caching