Fixing KeyIterator used for JuMPArray to work also when index sets are non indexable.#836

Merged

joehuchette merged 8 commits intojump-dev:masterfrom IssamT:master

Sep 27, 2016

+97-6

Commits on Aug 21, 2016

Commits on Aug 23, 2016

Commits on Sep 3, 2016

improved KeyIterator of JuMPArrays in two ways:
IssamT
committed

Commits on Sep 8, 2016

added JuMPKey, a tuple wrapper, to be used by keys(::JuMPArray)
IssamT
committed

Commits on Sep 12, 2016

added specialization of the iterator to keep good performance
IssamT
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Commits on Sep 21, 2016

- removed JuMPKey (to be added in separate PR)
IssamT
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