Completed homework#7

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cmolho wants to merge 3 commits intomac-comp394:masterfrom

Commits on Mar 5, 2018

finished part 1 refund transaction and tests

Cody Molho
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Cody Molho
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Commits on Mar 6, 2018

finished part 2 desugaring except a couple I'm uncertain about

Cody Molho
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Cody Molho
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Commits on Mar 9, 2018

final edits for part 2

Cody Molho
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Cody Molho
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