basic analytics / trending of test results

This shows a bunch of charts (reading data from the API), illustrating
some basic statistics of test results. Essentially it shows

(a) current data (e.g. considering only the most recent version)
(b) historical data (all versions, per month of release)

There are also some additional drill-downs - PostgreSQL major version
and release status (unstable, testing, stable).

The charts are rendered using 'flot' but a 'barnumbers' plugin was
necessary (see LICENSE.barnumbers) and also 'tickrotor' (license
embedded in the library).