first slides and a bit of lambda calculus!

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adds more LC, maybe, pulls code to fullwidth

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finish maybe section, beginning d3 section

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stripped back d3 section, added _ section

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adds _ combinators + bit about composition

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typos, slide demoing LC level of abstraction vs Turing

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note on expressitivity

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Merge pull request #2 from funjsldn/combinators

adds combinators minus d3