feature #2072: Improve describe-images function
feature #2072: Change describe-images ec2_code
feature #2072: Improve describe-instances function
feature #2072: Include recently terminated instances in describe_instances xml
feature #2072: Use first level ETIME
feature #2259: Add CreateImage
feature #2259: Add CreateSnapshot
feature #2259: Delete EBS_VOLUME attar when creating a new snapshot
feature #2259: Add ebs and ami checks in EC2Image
feature #2259: Add DeleteSnapshot
feature #2259: Add DescribeSnapshots
feature #2259: Add CreateTags
feature #2259: Use EBS_SNAPSHOT attar
feature #2259: Add DeleteTags
feature #2259: Add DescribeTags
feature #2259: Move tags functionality to tags.rb
feature #2259: Now RegisterImage is required to use an image. It will include EC2_AMI attr
feature #2259: CreateVolume from Snapshot
feature #2259: Use OpenNebula templates instead of file based erbs
feature #2259: Disable create-image functionality