ARROW-194: C++: Allow read-only memory mapped source#72

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jihoonson wants to merge 6 commits intoapache:masterfrom

jihoonson:ARROW-194

Commits on May 7, 2016

Allow read-only memory mapped source.
jihoonson
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Commits on May 9, 2016

Change the type of protection flag from int8_t to int
jihoonson
committed