v0.8.2

• Added missing jQuery UI sprite files, causing collectstatic to throw errors (most reported on Heroku)
• Page system check for on_delete actions of ForeignKeys was throwing false positives when page class decends from an abstract class (Alejandro Giacometti)
• Page system check for on_delete actions of ForeignKeys now only raises warnings, not errors
• Fixed a regression where form builder submissions containing a number field would fail with a JSON serialisation error
• Resizing an image with a focal point equal to the image size would result in a divide-by-zero error
• Focal point indicator would sometimes be positioned incorrectly for small or thin images
• Fix: Focal point chooser background colour changed to grey to make working with transparent images easier
• Elasticsearch configuration now supports specifying HTTP authentication parameters as part of the URL, and defaults to ports 80 (HTTP) and 443 (HTTPS) if port number not specified
• Fixed a TypeError when previewing pages that use RoutablePageMixin
• Rendering image with missing file in rich text no longer crashes the entire page
• IOErrors thrown by underlying image libraries that are not reporting a missing image file are no longer caught
• Fix: Minimum Pillow version bumped to 2.6.1 to work around a crash when using images with transparency
• Fix: Images with transparency are now handled better when being used in feature detection