Bump version back to 1.0.0, to prepare for a new release vote.

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1605693 13f79535-47bb-0310-9956-ffa450edef68
Force the qualifier to be 'RELEASE' in preparation for the 1.0.0 release
vote.

git-svn-id: https://svn.apache.org/repos/asf/sling/trunk@1605694 13f79535-47bb-0310-9956-ffa450edef68