Info override

Makes it possible to override which info-file bandaid uses on the commandline.
The override is persisted into the yaml-file for future use.
I'd go with _bandaid_validate_project($project, drush_get_option('info-file', FALSE)); but I'm a sucker for terseness.

I might also just have checked for the option in _bandaid_validate_project(), but I'm rock'n'roll like that.