added tcp repeater. merged with udp repeater

repeater's config is changed slightly. There was a bug on old repeater config. You can't specify repeaterProtocol on an array.

{
    graphitePort: 9997
    , graphiteHost: "localhost"
    , port: 8125
    , backends: [ "./backends/repeater" ]
    , repeater:
    {
        udp: {
            enabled: true
            , debug: true
            , repeaterProtocol: "udp6"
            , hosts: [{host: "localhost", port: 9997}]
        }
        , tcp: {
            enabled: true
            , debug: true
            , maxConnections: 10
            , host: "localhost"
            , port: 9997
        }
    }

}