Add mod#145

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lbenet wants to merge 6 commits intomasterfrom

Commits on Jun 29, 2018

Implement mod(a,y)
Luis Benet
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Add tests
Luis Benet
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Add extended_mod(a, y), with tests
Luis Benet
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Change fld(a,b) -> floor(a,b)
Luis Benet
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Commits on Jun 30, 2018

Add tests involving pi
Luis Benet
committed
Fix tests
Luis Benet
committed