Merge pull request #38 from ncoghlan/issue-37-mypy-stubtest

Issue #37: Use mypy.stubcheck to validate stub file

Post-release NEWS fixup

Release 0.6.0

Merge pull request #15 from ncoghlan/update-test-matrix

Update test matrix

Merge pull request #11 from ncoghlan/issue7-infinite-loop-on-py35

Issue7 infinite loop on py35

Updates for 0.5.3 release

Prep for full release

Merged in dev (pull request #6)

Rebase on Python 3.5 and prep 0.5.0 release