Named Profile support

[derekjbernard]

It would be useful to have named profile support for multi account users like myself.

for example:

sshaws i-02b5e7ded36330cab --profile dev-acount

I gave it a go here:
https://github.com/derekjbernard/sshaws/tree/fb-add-profile-support

[FrederikP]

Thanks, I like the idea. Do you want to open a PR for this?