[gwt-contrib] Add basic logging to Scaffold app (issue651803)

[unnurg]

Reviewers: Ray Ryan,

Description:
Add basic logging to Scaffold app

Please review this at http://gwt-code-reviews.appspot.com/651803/show

Affected files:
  M bikeshed/src/com/google/gwt/sample/expenses/gwt/Scaffold.gwt.xml
  M  
user/src/com/google/gwt/requestfactory/client/impl/RequestFactoryJsonImpl.java


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