* 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)
* 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
In previous versions, an Elasticsearch connection URL in ``WAGTAILSEARCH_BACKENDS`` without an explicit port number (e.g. ``http://localhost/``) would be treated as port 9200 (the Elasticsearch default) whereas the correct behaviour would be to use the default http/https port of 80/443. This behaviour has now been fixed, so sites running Elasticsearch on port 9200 must now specify this explicitly - e.g. ``http://localhost:9200``. (Projects using the default settings, or the settings given in the Wagtail documentation, are unaffected.)