initial working version

@feanil @jarv  Inventory script targeting the ASG.  Could be rolled into ec2.py, but I'd rather get our version to the latest and fix it to use profiles before integrating.

Output looks like so:
```
{
  "InService": [
    "10.0.47.127", 
    "10.0.30.137"
  ], 
  "Terminating:Wait": [
    "10.0.11.83"
  ], 
  "e-d-CommonClusterServerAsGroup": [
    "10.0.47.127", 
    "10.0.46.174", 
    "10.0.48.104"
  ], 
  "e-d-CommonClusterServerAsGroup_InService": [
    "10.0.47.127", 
    "10.0.46.174", 
    "10.0.48.104"
  ]
}
```
The standard python name to do for a script that's run instead of loaded is add a `if __name __ == '__main__'` and do argument parsing in that block (or a function)