[#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
[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
[#564] Removed duplicate asset file declarations
Merge pull request #609 from akvo/feature/du_564_assets

Static assets & Django Pipeline support