Upgrade redis to 0.12.1

Requires updating the default params to the Redis constructor
Merge pull request #108 from stormpath/redis

Upgrade redis to 0.12.1
More descriptive 401 for fallback case
Merge pull request #111 from stormpath/api-auth-error-codes

More descriptive 401 for fallback case
Merge branch 'develop' of https://github.com/stormpath/stormpath-sdk-node into develop