Added check to make sure we're running command from toplevel or repository.

	modified:   buildmanager.drush.inc
Added buildmanager-find-make-files command.

	modified:   buildmanager.drush.inc
Changed buildmanager config example.

  Simplify. Move Drush Subtree specific stuff into Drush Subtree project.

	renamed:    buildmanager.example-prod.yml -> buildmanager.config.yml
	deleted:    buildmanager.example-dev.yml
Updated documentation, examples, and removed --no-recursion default.

	modified:   README.md
	modified:   buildmanager.config.yml
	modified:   buildmanager.drush.inc
Added central execution of build commands and basic error handling.

	modified:   buildmanager.drush.inc