Add screenshot service proxy
Wait for page to be ready before taking screenshot
Clip screenshots to visualisation, forward cache headers
Add styles to ensure screenshot are clipped to correct size
Add missing tests for render_png middleware
Integrate PNG fallbacks into modules
Fix render_png middleware, add missing tests
Merge fco-dashboard into module-png-output-2
Merge branch 'master' into module-png-output-2
Enable PNG fallback for availability module
Merge pull request #26 from alphagov/module-png-output-2

PNG fallback images