Update examples
Conform to Shiny 1.0
Add setValue to StringField
Remaning Shiny 1.0 conformity
Fix setting initial value for token StringFields
Add close_on_confirm option to Popover
Add name passthrough to StringField_Inputs
Centralize config loading

This enables setting defaults using a class definition instead of passing options to the constructor.
Allow class options to be functions
Remap 'on' option to '_on', to avoid conflicting with ::on