root_spec uses Envconfig::Root.new(), not Envconfig.load().
Envconfig.load argument is optional, defaults to ENV.
Updated usage examples in README.md
shared_examples "empty configuration" extracted from smtp_spec.
memcached support, with no providers yet.
Memcached::Memcachier.
SMTP example in README.
memcached example in README.
Redis support, with no providers yet.
Redis::Openredis.
UrlParser extracted from Redis::Openredis implementation.
FIX: redis UrlParser usage refactor.
FIX: redis
Redis::ConfigFilter module from Redis::Openredis.
Extracted shared_examples "redis configuration"
Redis::Redisgreen.
Redis::Rediscloud.
Redis::Redistogo.
FIX: redistogo README.
Smtp::Mailgun.