Merge https://github.com/peerlibrary/peerlibrary
Merge branch 'master' of github.com:peerlibrary/peerlibrary
Missed import.
Allow configuring number of workers.
Unnecessary.
Improved script for running.
Better script.
Get public files out.
Make real links in README.
Cleans annotations and comments. See #558
Added migration for cleaning HTML body.

See #558.
Unnecessary.
Missed in the past refactoring.
Added comments about errors.
Don't start getting work before jobs are started.

Otherwise observer runs, tries to get all the work, but work is not
available because jobs are not yet started, and then those jobs are not
tried to get again until a new job is added to the queue (observe has
to trigger again).
Correctly handle missing files.

When files are not served by nginx but by Meteor, we have to make sure
missing files really return 404 and not Meteor initial page.
Improved invitation email text. Fixes #487
Renamed URL for accepting the invitation.
Fixed accept invitation dialog style. See #604
Allow a person to be invited multiple times.

Until they accept the invitation and they register.