Network Interfaces: Added attach/detach support.
Network Interfaces: Added attach/detach support. (added test threshold for Boto 2.32)
Make S3 Model Timestamps Consistent By Using UTC

UTC seems to be default timezone for AWS, and the time strings are reporting as GMT, yet the date time is the local time zone.
Merge pull request #207 from DreadPirateShawn/NetworkInterfacesAttachDetach

Network Interfaces: Added attach/detach support.
Merge pull request #208 from clorenz7/master

Make S3 Model Timestamps Consistent By Using UTC