Copied autoplay attribute from video xmoudle to videoalpha. Now students will have the video autoplaying, and in Studio it will be pause by default.
Added lettuce tests for autoplay in videoalpha.
disables pylint warning for lettuce tests syntax
Moved the definition of autoplay attribute to videoalpha_module.py file. Changed double negative if statement for autoplay check to simple if.
Merge pull request #123 from edx/valera/no_autoplay_videoalpha_studio

Valera/no autoplay videoalpha studio