Improve the itertools API (RFC 49)

This PR makes the changes described in RFC 49. These include making `fold` non-partial and adding the `fold_partial`, `filter_map`, and `flat_map` methods. All classes in the itertools package other than `Iter` have been removed. Resolves #2189
ponylang · Aug 30, 2017 · a4fbcd8 · a4fbcd8
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diff --git a/packages/itertools/_test.pony b/packages/itertools/_test.pony
diff --git a/packages/itertools/chain.pony b/packages/itertools/chain.pony
diff --git a/packages/itertools/cycle.pony b/packages/itertools/cycle.pony
diff --git a/packages/itertools/filter.pony b/packages/itertools/filter.pony