Merge branch 'release-2.1.20' into develop
fetch up to 50 items per call (7691)
Merge pull request #26 from dpla/7691-fetch-page-size

Fetch up to 50 items per call (7691)
Sync with new aggregate views (7542)
Dynamically generate view counts (7622)
Add new rake task to delete reports
Integrate ruby zip gem
Explicitly state how rubyzip should be called by 'require'
Merge pull request #24 from dpla/7542-7622-aggregate-views

Aggregate views (7542, 7622)
Version 3.0.0
Merge branch 'release-3.0.0'