Added Checkins, Photos and fixed a gaping security concern

I really really hope that nobody has been using this code in production after seeing that SSL verification is turned off (and hardcoded off) for everybody. That's really not cool. I've added two methods to let people turn them on or off. 

I've also added POST support to the bundled HTTP adapter. I'm trying not to rewrite this or step on your toes, but this needed to be done. Please merge ASAP and tag a new version.