Added the ability to release the currently bound EIP during instance deletion.
Merge branch 'release-eip' into enhanced
Fixed method call to public_ip_address for log line.
Made check for release EIP when the server doesn't have a public IP address.
Changed if test to use "and" to control flow.
Merge branch 'release-eip' into enhanced.

- Pull in logical && change to control flow "and".
Fixes for error message and domain attribute usage.
Merge branch 'enhanced' of https://github.com/nickryand/knife-ec2 into enhanced
Merge pull request #2 from nickryand/enhanced

Add the ability to release the currently attach Elastic IP