in some cases we need to get the value bypassing the customer getter
fix mixins & their tests to use dcl / register
add test for Stateful._get
fix path issues with dui/tests/mixins
custom elements
user level documentation
rename Stateful.set() --> mix() to avoid confusion w/original set("name", val)
Fix popup test failure.
dropdown must be display:block but custom nodes are display:inline by default.
Update Stateful.md