sbt/sbt — pull request #1516 by jsuereth (2014-08-08 19:31:07+00:00)
Title: Allow root plugins to be disabled.

Fixes #1455

* Add a mechanism to detect if a plugin clause includes/excludes
a particular plugin.
* Add a filter for our "enabling" clauses so that user-excluded
root plugins do not show up.
* Add a test to ensure this succeed.

Review by @eed3si9n