Add findOrNew(attrs) to CIDMapping ctor mixin
Update Model: Don't save options object passed to constructor
Add basic auth support
Revert "Add basic auth support"

This reverts commit 76f3d08026aa6b44730884865864e8d6b17828c0.

Basic auth should be done with the Authorization header directly:

  Authorization: "Basic "+ window.btoa("user:pass")