Fixed #3373 : change methode of verification to audio (more secure)
Fixed #3406 : Change the position logic of canvas on SHOW_ALL mode

In addition:
Automatically add viewport metas into user’s custom setting. To avoid
viewport rescale problem by user input.
Merge pull request #1319 from pandamicro/develop

Fixed #3406 : Change the position logic of canvas on SHOW_ALL mode