adds downloads service logic and tests

adds download counts to homepage
adds totalPackages method to couch
reworks download functionality

adds downloads counts to package pages

adds error logging to downloads

fixes tests in company and registry facets
adds numbat-config.example.js and keeps our seekrits secure :-P
adds config.example.js and relevant dev/ssl/ contents
adds latency metrics to couchdb
bugfixes
adds metrics to downloads service
adds latency metrics to company facet
adds latency metrics to registry facet
adds latency metrics to company facet
adds redis latency metric for sessions