Merge pull request #9 from erik-johnson/2013.02

Added null and empty checks to isPublicIpAddress
[maven-release-plugin] prepare release dasein-cloud-ibm-2013.02.5
[maven-release-plugin] prepare for next development iteration
[maven-release-plugin] prepare release dasein-cloud-ibm-2013.02.6
[maven-release-plugin] prepare for next development iteration
Merge remote-tracking branch 'upstream/2013.02' into 2013.02