doc(CHANGELOG.md): add entry for v2.0.0

doc(CHANGELOG.md): add entry for v2.0.0-rc2

Merge pull request deis#755 from smothiki/release-rc1

feat(changelog): update changelog to v2.0.0-rc1

Merge pull request deis#730 from vdice/release-beta4

doc(CHANGELOG.md): add entry for v2.0.0-beta4

releasing workflow

releasing workflow beta2

Deis workflow v2 beta1

v2 alpha release