Added Func for instance retirements
Merge branch 'master' of github.com:rmenn/goamz
Added Describe Volume func
Rebase from crowdmod master
Added func for EBS attachment
Fixed bug with describe volumes attachment set struct
Added test cases for DescribeInstanceStatus & Describe Volumes
added responses for Describe volumes and Describe instance status
Naming convention foobar fixed for AttachVolumeResp
Test case for AttachVolume added
Merge pull request #262 from rmenn/master

Added DescribeInstanceStatus, DescribeVolumes, AttachVolume