Mod by an interval#178

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dpsanders wants to merge 7 commits intomasterfrom

Commits on Jun 29, 2018

Implement mod(a,y)
Luis Benet
committed
Add tests
Luis Benet
committed
Add extended_mod(a, y), with tests
Luis Benet
committed
Change fld(a,b) -> floor(a,b)
Luis Benet
committed

Commits on Jun 30, 2018

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

Commits on Jul 9, 2018

Interval mod
dpsanders
committed