R1:fd5beffb9950

Remove PhabricatorRepositoryDefaultCommitMessageDetailParser

Summary: See discussion in T1544. This has been obsoleted by simpler/better mechanisms.

Test Plan: Edited a repository; ran a parse task.

Reviewers: edward

Reviewed By: edward

CC: aran

Maniphest Tasks: T1544

Differential Revision: https://secure.phabricator.com/D3977