make createSnapshotCard work
make deleteSnapshotCard in notification-card-list to work
add [API] to comments before declaring public APIs
add apis for manipulating card UIs
add apis for manipulating card UIs examples
add example for renderer to use uiConfig
add support for create and delete snapshot cards from renderer
change container element id to "cards_container"
change container element id to "cards_container"
add getCardWithKey and make new created (snapshot) card flash itself