fixed aggregation using negative value for aggregation sum
changed coverage to istanbul
fixed mongodb denodeify binding wrong context

added hash fingerprint, hashed_fingerprint
added lookup hashed_fingerprint and hashed_hashed_fingerprint
changed npm install to --production
changed request logging to tiny (https://www.npmjs.org/package/morgan#tiny)
added more fields to top10
removed imagemin build task
added imagemin processed image ressources

updated gitignore