language option is invalid print mesage

If we input invalid mistook language option
[AUTO] : updating submodule reference to latest autogenerated bindings
Merge pull request #3494 from CocosRobot/updategeneratedsubmodule_1377656189

[AUTO] : updating submodule reference to latest autogenerated bindings
Python2.x 3.x runnable

For Python2.x 3.x runnable, I used print()
Merge pull request #3495 from shinriyo/shinriyo

Python2.x 3.x runnable