Check if profile exists command

We use several different profiles for uploading our static website to different environments, each environment has it's own profile. It would be nice to have a way to check if a profile is configured and if not prompt the user to configure the profile, it could even be an extra parameter for the configure command, ex. `aws configure --skip-exists`

We have a deployment bash script that configures your environment, including installing awscli via pip, this would be a nice addition to that script