Fix: GoRestServer can't deploy the HTTP interfaces with same path and different method type

[Patrick0308]

now if we config this

  "UserProvider":
    protocol : "rest"
    # 相当于dubbo.xml中的interface
    interface : "com.ikurento.user.UserProvider"
    rest_path: "/UserProvider"
    methods:
    - name: "GetUser"
      rest_path: "/GetUser"
      rest_method: "GET"
      rest_query_params: "0:id"
    - name: "GetUser0"
      rest_path: "/GetUser"
      rest_method: "POST"
      rest_produces: "application/json"
      rest_consumes: "application/json;charset=utf-8,*/*"

Some error was happen.

What this PR does:
make GoRestServer support to deploy the HTTP interfaces with same path and different method type

[zouyx]

Fix travis pls.

Should you describe how to use this feature? like add a document or samples.....?