bc1e9afe4b
This: 1. Introduces a new override using the `pluggable_override` decorator. It is now possible to specify a custom way of getting XBlock's icon by defining `GET_UNIT_ICON_IMPL` in settings. 2. Introduces a way to add custom `XBLOCK_MIXINS` by defining `XBLOCK_EXTRA_MIXINS` in settings. This allows, e.g. to add new fields to XBlocks.
common ------ This directory contains common code shared between LMS and CMS, such as Mako templates, CSS, and Coffescript.