ALM-400 show "not subscribed" in user profile if admin user has not subscribed to any report
ALM-420 include addressable gem in Gemfile. Use standard net/http library
ALM-392 update documentation for new alert system
ALM-436 added documentation for updated rake tasks
ALM-388 allow searching of alerts by article DOI
ALM-388 added acceptance tests for alerts in the articles admin dashboard
Merge branch 'release/v.2.9.1'