added unix sockets and proxy protocol to frontends and servers

fixed some stuff regarding Docker

- 500rate.http wasn't copied into the Docker container

update docs and multiple breaking changes.

- default Zookeeper node is now /magnetic/localproxy
- config struct is reshuffled: JSON now has a different format
- SpikeLimits are now properly removed on updates

tag 0.5.1 adds compiled linux executable

adds compiled linux binary

tag 0.5

fix for data types #2

fix for data types

forgot to update docs

redesign kafka and metrics feeds