fixes #240, #274, #108
Merge pull request #305 from jsmartin/devel

fixes #240, #274, #108
Removes orphaned code.
Serialize tag attributes to ASG properties in ec2_asg

Fixes #108
Merge pull request #308 from jsmartin/asg_orphaned_code

Removes orphaned code.
asg will now be terminated if state=absent.

adds mutually exclusive options
Merge pull request #309 from jsmartin/asg_fix_delete

asg will now be terminated if state=absent.
make sure 'present' is fully equivalente of 'installed' and remove installed from
feedback in favoer of 'present'