As per IM review, added tests for Abstract<String>, and for graceful fail with "conflicting" generic return types. That is, we don't tolerate the following, but at least we don't generated bad code for it:
@UiFactory
Foo<Bar> getFooBar() { ... }
@UiFactory
Foo<Baz> getFooBaze() { ... }
Submitting soon.
http://gwt-code-reviews.appspot.com/106801
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