[maven-release-plugin] prepare release 0.9.RC1
[maven-release-plugin] prepare release 0.9.RC1

kangkot/spatial,RobertBierbauer/spatial,RobertBierbauer/spatial,RobertBierbauer/spatial,antonini/spatial,cgourlay/spatial,cgourlay/spatial,antonini/spatial,antonini/spatial,cgourlay/spatial,kangkot/spatial,cgourlay/spatial,antonini/spatial,kangkot/spatial,kangkot/spatial,kangkot/spatial,cgourlay/spatial,RobertBierbauer/spatial,antonini/spatial,RobertBierbauer/spatial