openlayers/ol3 — pull request #1048 by twpayne (2013-09-20 13:26:21+00:00)
Title: Replace source ready flag with loading/ready/error enum

Currently sources have a "ready" boolean to indicate whether they are loading (false) or ready (true).

This PR replaces this boolean with a tri-state enum: loading/ready/error.

Note that this PR depends on #1047.