def auth_url
      auth_call = prepare_api_call("", :params=>{:api_key=>@api_key},
        :base_url=>ODESK_AUTH_URL, :format=>nil, :method=>:get, :auth=>false)
      data = auth_call[:params].to_a.map{|pair| pair.join '='}.join('&')
      return auth_call[:url]+"?"+data
    end
def auth_url
      auth_call = prepare_api_call("", :params=>{:api_key=>@api_key},
        :base_url=>ODESK_AUTH_URL, :format=>nil, :method=>:get, :auth=>false)
      data = auth_call[:params].to_a.map{|pair| pair.join '='}.join('&')
      return auth_call[:url]+"?"+data
    end
Returns the URL that authenticates the application for the current user.
 This is used for web applications only