Remove setting of PS1 from awsenv
 - better to add something to .bash_prompt that includes $AWSUSER in PS1
cloudcaster multi-group support

- attaches list of security group IDs to LC / interface
- also updates ec2createapp to also attach list
Switch all shebangs to #!/usr/bin/env python
multi-group support for cloudcaster

- fix an iteration in early code committed before testing
- only post a secgrp once to the list of security groups
Merge pull request #35 from yo61/feature/fix_aws_env_ps1

Remove setting of PS1 from awsenv.
Should never really have committed awsenv in its original form :)
Merge pull request #40 from yo61/feature/rb_gh39_fix_shebang

Feature/rb gh39 fix shebang.
thx robin.
Merge pull request #38 from WrathOfChris/cm-cloudcaster-multigroup

cloudcaster multi-group support.

new app.groups list parameter that allows additional multiple security groups to be added to an instance.
awsenv: document usage
Merge pull request #41 from WrathOfChris/cm-awsenv-docs

awsenv: document usage