def create_membership(organization_id, params)
      http.post(membership_endpoint(organization_id), body: params) do |response|
        response.parsed_body
      end
    end
def create_membership(organization_id, params)
      http.post(membership_endpoint(organization_id), body: params) do |response|
        response.parsed_body
      end
    end
Create organization membership

 [API]
   Method: <tt>POST /api/v1/organizations/:id/memberships</tt>

   Documentation: http://developers.rexpense.com/api/memberships#create