ARROW-3121: [C++] Mean aggregate kernel - #3708

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fsaintjacques:ARROW-3121-mean-aggregate

Commits on Feb 26, 2019

Move TypeTraits into sum-internal.h
fsaintjacques
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8bc293f
Refactor sum implementation
fsaintjacques
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3a1a0cd
Implement mean aggregate
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7929140
Add documentation per review
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c448bcb
Deal with NaN values in sum
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d1191fd
Refactor with ternary
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d41db22
reformat
fsaintjacques
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0d39c1f