final docs changes
fixes user roles
whoops, missed ye ol link
adam and kim's edits
Added an app to contain the Perma monitoring related tasks. Here,
we can keep an eye on the health of Perma (without mixing that
code with our Perma code)

Added a first pass at a service that creates a PhantomJS capture.
This will be run by devops (our monitoring suite) ever n minutes
to ensure that the archiving pipeline is working. We'll want to
flesh this out so that it mirrors our full archiving task.
Forgot to add updated files to last commit.
Removed a couple of crufty imports.
Added a basic cleanup task to remove unused archives generated by
the monitoring task.
Reworked the way we writing the monitoring temp files. We're now
using a more Django friendly way with FileSystemStorage. Hopefully
this'll make it easier to deploy on many different types of storage
systems.
Freshened up prod settings with correct name of celerybeat task
for deleting old monitor-generated screencaps.
Merge branch 'develop' of github.com:harvard-lil/perma into develop
Bug fix: removed dup func.
Freshened up stats.