Update RDS example to use full option names

We don't support the short option names.

Fixes #235.
Merge branch 'fix-235' into develop

* fix-235:
  Update RDS example to use full option names
Customization to make it easier to deal with bootstrapping data from iam create-virtual-mfa-device call.
Fix and use FileArgument class.  Add test for unwritable outfile.
Merge branch 'iam-vmfa' of git://github.com/garnaat/aws-cli into garnaat-iam-vmfa