http access log. fix #144
http access log. fix #144

e.g.:
curl 'http://localhost:6063/get?target=-1.851da80d0d53197a35e4cd39bde618d4&target=-1.45039f6d4a6573efecca82ec1b421a70&maxDataPoints=20&from=1454770288'
curl -X POST -d target=-1.851da80d0d53197a35e4cd39bde618d4 -d target=-1.45039f6d4a6573efecca82ec1b421a70 -d maxDataPoints=20 -d from=1454770288 http://localhost:6063/get
curl -X POST -d target=target=-1.851da80d0d53197a35e4cd39bde618d4 -d target=-1.45039f6d4a6573efecca82ec1b421a70 -d maxDataPoints=20 -d from=1454770288 http://localhost:6063/get

2016/02/18 06:21:53 [I] http.Get(): INCOMING REQ "GET" from: "1454770288", to: "" targets: ["-1.851da80d0d53197a35e4cd39bde618d4" "-1.45039f6d4a6573efecca82ec1b421a70"], maxDataPoints: "20"
2016/02/18 06:29:07 [I] http.Get(): INCOMING REQ "POST" from: "1454770288", to: "" targets: ["-1.851da80d0d53197a35e4cd39bde618d4" "-1.45039f6d4a6573efecca82ec1b421a70"], maxDataPoints: "20"
2016/02/18 06:27:46 [I] http.Get(): INCOMING REQ "POST" from: "1454770288", to: "" targets: ["target=-1.851da80d0d53197a35e4cd39bde618d4" "-1.45039f6d4a6573efecca82ec1b421a70"], maxDataPoints: "20"

OOM-Killer/metrictank,replay/metrictank,replay/metrictank,replay/metrictank,raintank/raintank-metric,raintank/raintank-metric,raintank/metrictank,raintank/metrictank,raintank/metrictank,raintank/raintank-metric,replay/metrictank,OOM-Killer/metrictank,raintank/metrictank,OOM-Killer/metrictank