[maven-release-plugin] copy for tag v1.0.0-rc6

[maven-release-plugin] copy for tag v1.0.0-rc5

[maven-release-plugin] prepare release v0.9.1-rc3

[maven-release-plugin] copy for tag v0.9.0-incubating

[maven-release-plugin] copy for tag v0.8.1-incubating

[maven-release-plugin] copy for tag v0.8.0-incubating

Revert "Update version to 0.7.3-SNAPSHOT"

This reverts commit e5fbdac.

Release v0.7.1

Use new Spark EC2 scripts by default

Update version number to 0.6.2