Corrected spelling error that was preventing the propagate_at_launch attribute from being set properly in Eucalyptus, and presumably in AWS too.
fix typo in detach_subnets()
Add unit test for detach_subnets()
Unit test for autoscaling tags, and specific test for setting propagate_at_launch in endElement.
Merge pull request #1739 from jpommer/as_tags_propagation_fix

Corrected spelling error that was preventing the propagate_at_launch attribute. Fixes #1739.
Remove unused code that causes an exception in rare cases and add a unit test for that case. Fixes #1748.
Merge pull request #1771 from danielgtaylor/term-instances

Remove unused code that causes an exception in rare cases and add a unit test. Fixes #1771, #1748.
Merge pull request #1760 from martinthegeek/develop

fix typo in detach_subnets(). Fixes #1760.