Merge pull request pulp#254 from CodeHeeler/release-3.0.0b8

Bump version to beta8, add release notes

Merge pull request pulp#249 from CodeHeeler/release-3.0.0b7

Bump version to beta7, add release notes

Merge pull request pulp#244 from CodeHeeler/release-3.0.0b6

Bump version to beta6, add release notes

Merge pull request pulp#236 from CodeHeeler/release-3.0.0b5

Bump version to beta5, add release notes

Merge pull request pulp#229 from CodeHeeler/release-3.0.0b4

Bump version to beta4, add release notes

Pulp Python 2.0.3 GA

Merge pull request pulp#195 from pcreech/beta2-cps

Beta2 cps

2.0.3 beta 1

Merge pull request pulp#181 from werwty/3.0-dev

Bump version to beta3, add release notes

Bump version for b2 release, add python_requires specifier