meme: allow setting to private

[Mitchell Amihod]

memecaptain API allows for setting private memes created.

This should be an option for sassybot - i think users of HC might not realize they are leaking info via memes (which get displayed for all on memecaptain)

[Robert Bergman]

Agreed. See this recently merged PR: https://bitbucket.org/atlassianlabs/ac-koa-hipchat-sassy/pull-requests/11/added-private-true-to-payload-for-meme

I will deploy this soon.

[Mitchell Amihod]

thanks bob

[Robert Bergman]

Deployed!