Merge branch 'hotfix-1.4.1'
Fixes #799
Thumbnails have their own route (fixes #804)
Merge pull request #805 from duke-libraries/804-thumbnail-url

Thumbnails have their own route (fixes #804)
work around for collections with more than 1000 items; closes #807
Merge branch 'hotfix-1.4.2'
Merge branch 'hotfix-1.4.2' into develop
Merge branch 'develop' of github.com:duke-libraries/dul-hydra into develop
add content ds checksum to collection info csv report; closes #811
Merge branch 'hotfix-1.4.3'
Merge branch 'hotfix-1.4.3' into develop

Conflicts:
	lib/dul_hydra/version.rb
handle case where entry not found in checksum file; closes #809
Merge branch 'hotfix-1.4.4' into develop
Upgrade dul-hydra to hydra-head 7.0