We use a fairly custom Pipeline configuration for Djblets static media,

making use of wrappers for the LessCSS compiler and a standard set of

options and plugins for Babel and LessCSS. Consuming applications

(namely Review Board) use the same options, and have previously had to

duplicate the configuration. This meant that they didn't gain any

benefits from improvements made to this configuration.
This change introduces a new djblets.pipeline.settings module, which

contains a build_pipeline_settings() function that builds a standard

PIPELINE settings dictionary. It provides the standard settings we

use, but allows a degree of customization. Consumers can make use of

this directly, or modify the generated settings after the fact.

Built a Djblets package successfully.
Unit tests pass.
Made use of this in Review Board and verified the resulting static media.