Merge pull request #1 from guardian/gemspec-foreman-etc

Use Gemfile, Procfile, etc
correct documentation
add prod arguments to Procfile for convenience
some very basic improvements for mobile use
add to blacklist
add to blacklist
correct install instructions
use user-tier internal
blacklist tweaks
always show-related (warming caches)
added /politics/constituency/.* to the blacklist
add /digital-agency/page/.* to the blacklist
added median and mode averages and didn't test it at all
correct rounding in ui
correct property labeling
ergh
more sorting, less random plucking
how about getting the most commonly occuring value, not the least
cookie blasting links
add helpful <title>