Merge pull request #423 from dhermes/cut-2.0.0-post1

Release v2.0.0-post1.

Merge pull request #404 from nathanielmanistaatgoogle/release-2.0.0

Release 2.0.0.

Merge pull request #341 from thobrla/master

Release v1.5.2

Merge pull request #304 from dhermes/release-1.5.1

Release 1.5.1.

Merge pull request #292 from dhermes/release-1.5.0

Releasing 1.5.0.

Merge pull request #216 from craigcitro/new_release

Update for v1.4.12 release.

Merge pull request #187 from craigcitro/new_release

Update for v1.4.11 release.

Merge pull request #183 from craigcitro/new_release

Update for v1.4.10 release.

Merge pull request #180 from craigcitro/new_release

Update for v1.4.9 release.

Merge pull request #177 from craigcitro/new_release

Release v1.4.8.