Heka message cleanup.

* Format update messages for simpler heka parsing.
Add the number of active connections to the status

* This reads the number of known, active connections. These only include
  clients that have sent a "hello". Need to add a auto-kick to boot
  clients that don't send a hello after some period of time.
Add socket timeout on pre-hello idle.

By default, don't time out (useful for development).
* removed "radical" from development statement for README.md
* Added sample heka toml conf file
* Moved ClientPing no-op wrapper func higher in file so it's more
  visible.
Change status message to be JSON
Attempt to resolve socket timeout issues

* reduce the amount of memcache clients to one, let it sort them out.
Single memcache handler

* formatting