feature(server): Add median read time reduce function. Show data when viewing individual page.
fix(server): Allow paths to contain any of '.-_' in site/<site>/path/<path>
chore(build): Use newest think-stats which fixes a bug in sorted()
fix(server): fix www.domain.tld matches when looking at a path.
add logging info
Merge branch 'page-read-time'
refactor(server): Add a test for read-time
feature(server): Show internal transfers when looking at an individual page.

* Keep track of where users come from and where they are going, as long as the move is internal.
* Add an `internal-transfer` reduce function.
* Show the data on the /site/<site>/path/<path> page.
fix(server): Do not count internal referrers as referrers.
fix(server): Ensure page hit data is available for every date in the date range when viewing a specific page.
fix(server): Fix read-time performance problems if the spread is large.

* Use the newest think-stats.
fix(server): Set the fallback referrer path to `/`
fix(server): Fix reduce/navigation->end not calling the superclass' end.
feat(server): Add filters & an entrance reduce stream.

* Filters run before the reduce streams.
* Remove the duplicate referrer->referrer_path & referrer_hostname found in multiple reduce streams.
Merge branch 'entrance-to-page'