knit indexes are bytestreams, not Unicode

[John Arbash Meinel]

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While I was probing around the Knit code, I found out that the current
KnitIndex parser reads in everything as a bytestream, and does not
convert it into Unicode. At present, we don't create Unicode revision
ids, but we claim to support them (Aaron has already proven we don't
support unicode file ids because our function for splitting them up by
hash requires a bytestream).

Anyway, I don't know how serious it is, but I just wanted to make people
aware.

(Mostly I found this out because you can't intern() a Unicode object,
but I was able to intern() the version ids used by KnitIndex)

John
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