Revert to using encrypted passwords - Got lost during a past merge

[asishallab]

This issue is relate to Issue #55 of the single-page-app-codegen.

In some past merge we lost the encryption of passwords and accidentally switched back to using cleartext passwords. Go back into the history of this skeleton project and rescue the respective code.

Also adjust all integration tests in the single-page-app-codegen projects to not generate the code for the user, role, and user_to_role data-models. Make sure all integration tests are running.