Issue #1860594 by penyaskito, damiankloip, xjm, alexpott, sun: Ensure that randomString() always returns a character that needs to be escaped for HTML.
Issue #2336355 by alexpott, Cottser: Fixed Refactor Attribute rendering so that class= is not printed.
Issue #2319487 by tim.plunkett, Cottser, larowlan: Remove ajax.inc.
Issue #2341701 by ParisLiakos: Provide an abstract logger.channel declaration.
Issue #2261425 by ParisLiakos, alexpott: Streamline aggregator's entities rendering with rest of core.
Issue #1342504 by jbrown, Jelle_S, Dave Reid: Support data URIs.