Fix ext packages

[regulad]

Summary

General Info

• [x] If code changes were made then they have been tested.
• [x] This PR fixes an issue (please put issue # in summary).
• [ ] This PR adds something new (e.g. new method or parameters).
• [ ] This PR is a breaking change (e.g. methods or parameters removed/renamed)
• [ ] This PR is not a code change (e.g. documentation, README, ...)

Fixes ext packages not being included by extending the list returned by setuptools#find_packages()

Resolves #141

[regulad]

Fixes #141

[dolfies]

One more thing. Can you change all the quotes to single quotes?

[regulad]

@dolfies done