Fixing API bug where voting on a non-existent poll generated a 500 server error.
Adding tests around voting. The multiple vote test still fails since it's not yet implemented.
Fixing race condition where a user could potentially vote multiple times on a strict poll.
Adding ability to cast multiple votes from the same IP on a non-strict poll.
Reading poll strictness from Redis cache before hitting MongoDB.
Tweaking 'npm test' run parameters.
Updating dependencies.