Loosen dependency on base in a few packages

I saw that several packages depended on `base >= 4.5.0 && < 5` but a few
were specifying `4.5.x`, which prevents these packages from installing
with base 4.6. I loosened up the dependencies and ran the tests under
4.6 and they passed.
Merge pull request #2 from MichaelXavier/loosen-base-dependencies

Loosen dependency on base in a few packages