Issue #53: Allow drush make to generate compiled and/or updated makefiles
Rename option to --lock to avoid confusion with make-generate command.
Add defaults array to generated makefile, and fix up some places where generate fails (e.g. if there are no modules).
Try to fix test that fails due to addition of 'Core' header.
Try again to fix tests that fail due to addition of 'Core' header.
Merge pull request #660 from PraxisLabs/make_lock

Allow drush make to generate compiled and/or updated makefiles. By @ergonlogic and @eelkeblok.