ElasticIP rotation of autoscale groups.  Disassociates EIP from old instance and associates EIP with new instance.  Add a limiter on number of instances to rotate, so rotations can be staged/tested without rotating all
Merge pull request #16 from WrathOfChris/cm-ec2rotatehosts-elasticip

ElasticIP rotation of autoscale groups.  Disassociates EIP from old inst...