message: Added missing export to property binder.
  This adds a missing export for the RemovalContext to propertyBinder.
diff: @@ -16,6 +16,7 @@ import { SingletonDataBinding, StatelessDataBinding } from './data_binder/statel
  import { DataBinderHandle } from './internal/dataBinderHandle';
  import { PropertyElement } from './internal/propertyElement';
  import { UpgradeType } from './internal/semvermap';
  +import { RemovalContext } from './data_binder/removalContext';
  import { IActivateDataBindingOptions } from './data_binder/IActivateDataBindingOptions';
  import {
  @@ -42,6 +43,7 @@ export {
  representationDestroyer,
  representationGenerator,
  representationInitializer,
  + RemovalContext,
  forEachProperty,
  UpgradeType,
  };
  