Refactor graphite calls in lib/webservice

Now uses several functions provided in the middleware (res.increment,
res.incrementIf, and res.incrementFeatures).

Does away with the ".rollup" suffix. When I added this originally I didn't fully
grok the composability of graphite metrics (it's easy to sumSeries(something.*)).
Log app IDs for routes with client_id
Further optimization
Merge pull request #778 from Singly/bg-refactor-webservice-graphite

Refactor webservice graphite calls