Move optionalDependencies to devDependencies [#300]
Move optionalDependencies to devDependencies [#300]

alexa-js/alexa-app,fremail/alexa-app,alexa-js/alexa-app,fremail/alexa-app,matt-kruse/alexa-app,fremail/alexa-app,matt-kruse/alexa-app,alexa-js/alexa-app,matt-kruse/alexa-app