Better AMI creation parms
Merge remote-tracking branch 'origin/master' into aio_node_ami
Force Ellis signup key to be 'secret' for AMI
Appsrently m1.small is fine after all
Merge pull request #50 from Metaswitch/aio_node_ami

Reviewer Andy: Extra tweaks to AMI creation
Only specify enum_server if one is configured for this environment
Reduce TTL for cluster DNS records to 60 seconds
Merge pull request #54 from Metaswitch/issue191

[Reviewer: Mike] Only specify enum_server if one is configured for this environment
Ensure DNS records are updated if TTL is wrong
Merge pull request #55 from Metaswitch/faster_scale_up

[Reviewer Matt] Faster scale up
Merge remote-tracking branch 'origin/master' into geo_redundancy