added ability to parse new argument for elastic ip / static ips
added code to validate that an elastic IP the user passes in on AWS actually has been allocated for them
added ability to associate elastic IPs with instances in AWS
removed iaas-specific info from baseagent
Merge remote-tracking branch 'org/master' into static-ip
Merge pull request #347 from shatterednirvana/static-ip

Enable users to specify an Elastic IP for their head node in AWS