Merge pull request #51 from NiteshKant/master

Fixes issue #50
[Gradle Release Plugin] - pre tag commit:  '1.1.111'.
[Gradle Release Plugin] - new version commit:  '1.1.112-SNAPSHOT'.
Merge pull request #52 from NiteshKant/master

Handling empty AZ in AZtoRegionMapper
[Gradle Release Plugin] - pre tag commit:  '1.1.112'.
[Gradle Release Plugin] - new version commit:  '1.1.113-SNAPSHOT'.
Fix for issue #55