Firehose users

Hi team -  

So I added option under "Users" tab on the dashboard to list all users, and click a button to add user as a "Firehose Member".  Once this button is pressed, the user is automatically assigned all interviews.

Also, if a user is already a Firehose member, then the button is greyed out/disabled.  

It wasn't for me, it was there already.  So I'm not sure what it's intended use was for, hence I left it for now.