Tag for release 0.8.1 of Apache Flink

Git tag for 0.8.0 release

Git tag for 0.7.0 release

Tag for release 0.6-incubating of Apache Flink (incubating)

The last commit before renaming the source code from eu.stratosphere …

…to org.apache.flink. See FLINK-920

Set version to 0.5

set version to 0.5-rc3

Set version to 0.5-rc2

Set version to release-0.5-rc1

Clean up destriptions and log/web display names.