[WIP] Added in some diff functions from libgit2#348

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kmctown merged 6 commits intomasterfrom

Jan 20, 2015

Commits on Jan 20, 2015

Added in some diff functions from libgit2
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John Haley
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Added failing test for `Diff.treeToWorkdirWithIndex`
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3b27c7d
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Shuffled around workdir diff unit test stubs
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Diff workdir tests pass
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`commit.getDiff` was diffing backwards
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Diff test: use nodegit to add diff file to index
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