Add script for getting freshdesk stats

Spin-off from https://github.com/gittip/www.gittip.com/issues/2110

http://freshdesk.com/api

Just thinking that it would be great to give some sort of introspection into the health of the support queue from chat. Not sure how that would work yet: listing stats, or listing actual ticket subjects. (I'm unsure what the final decision on privacy of tickets was.)