Save secret when creating passphrase

Summary:
Shame face :0

When passcodes save passwords like to authenticate to github the field used is called 'secret' not 'password.'  We need a follow up diff in Taskr to pass in secrets instead of passwords

Test Plan: Create a passphrase and use it to import a repo from github

Reviewers: ortutay

Reviewed By: ortutay

Differential Revision: http://ec2-54-69-108-116.us-west-2.compute.amazonaws.com/D49