[OTFC] Successful http Set for the daemon

Summary: Actually set the values to config.

Test Plan:
  $ curl  http://localhost:8088/set?key=123\&value="MTIz"^C
  $ rm ./daemon; go build github.com/gow/otfc/daemon && ./daemon 1,2>/dev/null &
  [1] 2612
  $ 2013/05/09 01:44:31 main.go:16: push

  $ curl  http://localhost:8088/set?key=123\&value="MTIz"
  2013/05/09 01:44:37 server.go:48: Key:  123 Value:  MTIz
  {"Status":"OK","Key":"123","Value":"MTIz"}

  $ curl  http://localhost:8088/set?key=123\&value="MTIz"
  2013/05/09 01:44:39 server.go:48: Key:  123 Value:  MTIz
  {"ErrNo":1004,"ErrInfo":"key [123]"}

  $ curl  http://localhost:8088/set?key=123abc\&value="MTIz"
  2013/05/09 01:44:52 server.go:48: Key:  123abc Value:  MTIz
  {"Status":"OK","Key":"123abc","Value":"MTIz"}

  $ curl  http://localhost:8088/set?key=123abc\&value="MTIz123"
  2013/05/09 01:44:56 server.go:48: Key:  123abc Value:  MTIz123
  {"ErrNo":1004,"ErrInfo":"key [123abc]"}

Reviewers: tommy.testy

Reviewed By: tommy.testy

Differential Revision: http://dev.chetan.io/D38