Rate Limiting based on [Token Bucket]() and [Leaky Bucket](https://en.wikipedia.org/wiki/Leaky_bucket#The_Leaky_Bucket_Algorithm_as_a_Meter) Algorithm
Upgrade eSockd and MochiWeb libraries to support Parameterized Connection Module
Improve emqttd_client to support fully asynchronous socket networking
Protocol Compliant - Session Present Flag (#163)
emqttd_client: replace gen_tcp:send with port_command (#358)
TCP sndbuf, recbuf, buffer tuning (#359)
emqttd_client.erl to handle ‘inet_async’, ‘inet_reply’ properly (#360)
Refator the [client/session management design]()
Fix the order of emqttd_app:start_server/1 (#367)
emqttd_ will crash (#374)
[benchmark for 0.13.0 release](https://github.com/emqtt/emqttd/wiki/benchmark-for-0.13.0-release)
3.1G memory and 50+ CPU/core: