Merge pull request #79 from koding/heartbeat-improvements

Heartbeat improvements
kontrol/postgres: remove the cleaner to recover from restarts
Client: do not cause memory leak
Merge pull request #81 from koding/memoryleak

Client: set send channel as nil
client: do not spam the console for heavy kite usage
sockjsclient: make buffer sizes configurable

This is needed so we can configure it on production environments easily.
Merge pull request #82 from koding/sockjsclient-options

sockjsclient: make buffer sizes configurable
client: add DialTimeout support
sockjsclient: set also deadline
Merge pull request #83 from koding/client-dial-timeout

client: add DialTimeout support
kontrol/kontrol.go: increase delay for heavy network based environments
kontrol/handlers: if we still get heartbeats, add them back
kontrol/handlers: handle another case