added packages and began package metrics implementation
Merge branch 'master' into feature-packages
measurements now expect a clear structure. this reduces the code complexity. added a utility method to retrieve hrefs for objects. introduced package structure. added sql median query.
added cmetrics. analyze error also catches error if package update fails. added purge method for repos. deletes all local data. only one root package per branch possible. otherwise some query qould be hard to not possible. newest files can be set to a date, to get all files present in a repo at a given point in time. added custom confirm dialog. removed branch and author count from repo overview. sending emails can be disabled using the SEND_EMAILS flag in the settings.
performance improvements for churn stats. now also computes directly on files. removed some duplicate code. fixed a bug where newest files could not be determined because date field was ambigous.
using median cc for c metrics. added packages rest api interface.
added django compressor