• Deprecation: Renamed flask_redis.Redis to flask_redis.FlaskRedis.
  Using the old name still works, but emits a deprecation warning, as it will
  be removed from the next version
• Deprecation: Setting a REDIS_DATABASE (or equivalent) now emits a
  deprecation warning as it will be removed in the version in favor of
  including the database number in REDIS_URL (or equivalent)
• Added a FlaskRedis.from_custom_provider(provider) class method for using
  any redis provider class that supports instantiation with a from_url
  class method
• Added a strict parameter to FlaskRedis which expects a boolean value
  and allows choosing between using redis.StrictRedis and redis.Redis
  as the default provider.
• Made FlaskRedis register as a Flask extension through Flask's extension
  API
• Rewrote test suite in py.test
• Got rid of the hacky attribute copying mechanism in favor of using the
  __getattr__ magic method to pass calls to the underlying client