Point at freezegun master since PR has been merged
Merge pull request #2052 from dstufft/freezegun-master

Point at freezegun master since PR has been merged
just the @cached_property bit
Merge pull request #2058 from bukzor/buck-cachedproperty

just the @cached_property bit
update changelog entry for PR 1838
Vendor Packaging
Upgrade setuptools
Implement PEP 440
Bring in the branch of setuptools that uses packaging as well