Switch from PHP memcache extension to memcached
Update storage purging scripts to use Redis
Remove 'pprint' parameter

All responses are now pretty-printed and served with their regular
Content-Type.
Rename v1 tests folder
Squash into JSON pretty-print commit
API version 3 [schema change]

All-JSON responses and other changes

Full details available at
https://www.zotero.org/support/dev/web_api/v3/changes_from_v2
Make PHP warnings fatal in API code

Missing array properties, etc.