time. Rather, we generate in-line logic that pkg_resources would provide.
This means that apps that don't actually use pkg_resources themselves
don't end up running it and we don't need to implicitly include the
setuptools egg in the script path.  Of course, if an application does
use setuptools, then setuptools will be one of it's requirements and
will be included in the path.

Added the ability to control script generation.

this api.