Ensure that ah_bootstrap recognizes an astropy_helpers submodule as a submodule even if the --no-git option is used (it checks for submodules without actually calling the git command).  Includes test.
Fix typo
Ensure that all subclassed commands get their own copies of the user_options and boolean_options attributes so that modifying them does not modify the base classes from setuptools
Preparing to release v0.4rc1
Completing v0.4rc1 release