(Manually) Publish weekly CIAPI performance graphs to labs.cityindex.com/performance blog

We've been asked to do a weekly analysis of live performance via a blog post to the http://labs.cityindex.com/performance blog.

This should include:

(a) Graphs of the performance of each service during the week.
(b) Analysis of any unusual latencies.

To begin with, we'll do this manually; once we've figured out which bits are standard, we'll automate those.