[MERGE] Implement PreviewTree.stored_kind, PreviewTree.is_executable

[Aaron Bentley]

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John Arbash Meinel wrote:
> John Arbash Meinel has voted tweak.
> Status is now: Conditionally approved
> Comment:
> Again, it seems like you need to test the case where the file *isn't*
> different from the base.

No, the existing PreviewTree tests handle that case.

> Also, you only test stored_kind() for file
> objects, and is_executable() for when it is True. I would like to see at
> least 2 tests for each function, so the test can't pass by just writing
> "def stored_kind(self): return 'file'"

The existing tests ensure that you cannot implement it that way.  I am
testing that if you change the value, the changed value is detected.

Aaron
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