fix the db.get deprecation warnings by converting to db.siteView.get
Increment site hits whenenver navigation data arrives.

* Add two new site functions, ensureExists and hit. hit adds to a site's hit count.
* When navigation data arrives, increment a site's hit count.
* Add count_all_page_views.js script to create sites and count uncounted pages.
Convert from updatedAt to createdAt when querying the database.

* mongo stores the creation date in the id, convert createdAt timestamps to dates and query on a document's _id
* Add a script to count the number of hits each site has.
Merge branch 'count-totals'