ARROW-627: [C++] Add compatibility macros for exported extern templates#447

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wesm wants to merge 3 commits intoapache:masterfrom

Commits on Mar 28, 2017

Add compatibility macros for exported extern templates, also to reduce compiler warnings in MSVC
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MSVC needs export annotation when instantiating templates
wesm
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Commits on Mar 29, 2017

Wrong define for msvc
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