scope.set(key, value [, options])
Tries to set
key in the scope to
value. This looks for the first context in the value where
key can be set. For example, if
"person.first.name", it will find the first
person.first is some type of Object whose
name property can be set.
A dot seperated path. Use
"."if you have a property name that includes a dot.
The value to be set.