It seems that we have to support much duplicated code to detect paths and such things just because we default to an unconfigured Annotation Driver.
We could get rid of lots of code in Doctrine\ORM\Tools\ and get rid of the problem having to specify mapping paths on the CLi or in the configuration (cli-config.php) like its discussed in
1. Make specifying the Mapping Driver a requirement to the user
2. Add a factory method to AnnotationDriver for ease of use (AnnotationReader configuration)
3. Change documentation for this