Merge pull request segmentio#14 from segmentio/ej/support-source

Allow assuming a source profile.

Merge pull request segmentio#15 from segmentio/fix-mac-release

Update makefile and readme instructions for mac release

Merge pull request segmentio#13 from segmentio/check-arguments-on-login

add a check on arguments during login

Merge pull request segmentio#12 from segmentio/ej/login

Add login subcommand.

Merge pull request segmentio#4 from segmentio/auto-role-session-name

default role session name to okta username:

Merge pull request segmentio#3 from segmentio/fix-autorelease

Fix auto release

Merge pull request segmentio#2 from segmentio/clean-up-aws-okta

[WIP] Get aws-okta ready for use