Fix problems with import and zipimport in particular #31

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jeff5 wants to merge 8 commits intojython:masterfrom jeff5:fix-import

+963-151

Commits on Jun 5, 2017

[Trivial] White space, comments and line-wrap only in zipimport module.
jeff5
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Commits on Jun 6, 2017

Expose PyZipImporter through CoreExposed.includes
jeff5
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Commits on Jun 12, 2017

Re-work PyZipImoprter construction closer to CPython and add unit test.
jeff5
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Commits on Jun 14, 2017

Add comment specifying zipimporter.get_data and a test
jeff5
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Commits on Jun 15, 2017

Conform behaviour of zipimporter.get_data() to CPython and enable test.
jeff5
committed

Commits on Jun 17, 2017

Commits on Jul 17, 2017

Corrections to zipimporter.get_filename and a test.
jeff5
committed