support for multiple profiles

[umang1912]

I use multiple aws accounts, and aws credentials file has good support for profiles with separate keys. Would be good to have here.

[docent-net]

Same here; would be nice to be able to provide "--profile" param or to switch between accounts within ui

[elloboblanco]

Third vote! It would be nice to have a currently active profile so you don't have to specify --profile interactively every time.

@umang1912 and @docent-net you can use --profile on individual commands

aws> ec2 describe-instances --profile PersonalAccount

[miked63017]

This would also be really useful if it had some sort of saml procedures built in, that would automatically select the new saml profile.

[donnemartin]

Thanks for the feedback everyone!

More discussion at #9

[jamesls]

Working on it.

[jamesls]

Implemented via #92