[#564] Added main, sites and widget assets to django-pipeline
[#564] Merged in feature/django-upgrade
[#564] Added widgets to django-pipeline
[#564] Modified machinery JS to export preview function.
Merge branch 'feature/django-upgrade' into feature/du_564_assets
Merge branch 'feature/django-upgrade' into feature/du_564_assets
Merge branch 'feature/django-upgrade' into feature/du_564_assets
[#564] Added partner sites widgets to pipeline
[#564] Removed unused files
Merge pull request #602 from akvo/master

[#592] Adding release notes for 2.3.7
#601 fix to release notes pages not sites
Merge pull request #603 from akvo/feature/601-releasenotesfix

#601 fix to release notes pages not sites
[564] Removed depriciated asset manager template tag
[#564] Merged with feature/django-upgrade
Merge branch 'feature/django-upgrade' into feature/du_564_assets
[#564] Switch to css files
[#477] Replaced created_at and last_modified_at with null instead of True
[#564] Removed duplicate asset file declarations
Merge pull request #609 from akvo/feature/du_564_assets

Static assets & Django Pipeline support
Merge pull request #610 from akvo/feature/django-upgrade

Feature/django upgrade