Generate calls to Reflector#registerSetters from the information in
provided `Directive#bind` values.
This is only an initial attempt - it covers only the most basic values
of `bind`.
Closes#780
+ Precede the call to `new ReflectionCapabilities()` with our generated
code which populates the reflection map statically.
+ Add the import of our generated code.
+ Once we are generating all necessary code, we will remove the
import of reflection_capabilities.dart and the instantiation of
`ReflectionCapabilities`, cutting the dependency on dart:mirrors.
Closes#761