Replace distribute_setup.py with ez_setup.py

and ``setuptools_bootstrap.py``
Merge pull request #38 from mwcraig/patch-1

Replace distribute_setup.py with ez_setup.py
Support `setup.py test --coverage` in affiliated packages.
Merge pull request #39 from mdboom/coverage

Support `setup.py test --coverage` in affiliated packages.
Simplify package-template usage and updating by requiring fewer files to
be edited.
Add information about pulling changes to package template
Store stuff in "metadata" section, not "affiliated" section.
Insert space before comment.
Fix documentation build
Change ``clean`` rule to remove generated docs

Made necessary by https://github.com/astropy/astropy/commit/b94fd38e5613c838c41ef5fa57ed9ba8289b5046
Elaborate on the need to search for .c files in a comment.
Merge pull request #41 from mdboom/auto-setup

Simplify package-template usage
Update to newer ez_setup.py
Add the current version of ah_bootstrap--for the tests themselves we will always copy over the latest version of ah_bootstrap (so that we can test ah_bootstrap itself), but there should still be a default copy of it in the package-template repo as well
Configure the package-template to use astropy_helpers.  By default includes astropy_helpers as a submodule. Yes, astropy_helpers is now a submodule of package_template which is a submodule of astropy_helpers
update the astropy_helpers version to include fix from c3f841b9e099f506a751b8a6971b15e7e3d6590a
Update the astropy_helpers version used in the package_template
Update the astropy_helpers version again; use the auto_use feature of ah_bootstrap.
Switch to using astropy_helpers for docs build.
Updated astropy_helpers version (included fix for Python 3)