ARROW-199: [C++] Refine third party dependency#75

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zhangh43 wants to merge 4 commits intoapache:masterfrom

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Commits on May 12, 2016

FLATBUFFERS_HOME must be set before cmake
zhangh43
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Commits on May 13, 2016

ARROW-199: [C++] Refine third party dependency
zhangh43
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Commits on May 14, 2016

ARROW-199: [C++] Refine third party dependency
zhangh43
committed

Commits on May 15, 2016

remove CMAKE_SKIP_INSTALL_ALL_DEPENDENCY for target install and fix typo
zhangh43
committed