composer/composer — pull request #3265 by dol (2014-09-08 14:43:17+00:00)
Title: Check for VCS reference difference in command 'status'

Composer status detects only uncommited changes for VCS packages. This patch
adds informations about different reference versions.
If a package has no uncommited changes, but differs from the
revision defined in composer.lock, a change message is triggered.

This commit is related to #1968

Missing pieces:
* Perforce support
* It might be better to add a separate abstract function to VcsDownloader for this check (reuse)