Reviewers: rjrjr,

Description:
This patch allows users to disable keyboard navigation support in
FastTree, which is sometimes desirable if a child widget handles
keyboard support itself (natively or not).  For example, you might want
to disable keyboard support if your FastTree contains a TextBox or
TextArea, in which the user might use the arrow keys to navigate to a
cursor position.

You might also disable keyboard if the Tree contains a very large item,
as doing so would allow the user to scroll using the up/down arrow keys.

Please review this at http://gwt-code-reviews.appspot.com/32801

Affected files:
   src-demo/com/google/gwt/gen2/demo/fasttree/client/FastTreeDemo.java
   src/com/google/gwt/gen2/complexpanel/client/FastTree.java
   test/com/google/gwt/gen2/complexpanel/client/FastTreeTest.java



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