Add SSHA1 password digest authentication to identity users
Merge pull request #10 from karenc/add-plone-password-authentication

Add SSHA1 password digest authentication to identity users
Add comment and error handling for plone password authentication code
Merge pull request #11 from karenc/add-plone-password-authentication

Add comment and error handling for plone password authentication code
Merge branch 'master' of github.com:openstax/accounts into representer-init