[mlpack-git] [mlpack] add train test split (#523)

[stereomatchingkiss]

One question, when I try to provide the support of multi slice(depth), I find out one problem--what should the labels organized?

Assume we have 2 images with 3 channels,the labels should be
Solution 1 : 
0, 1 
or

Solution 2 : 
 0, 0, 0, 1, 1, 1

According to current source codes, the train class always take one slice, so I should take solution 2, what is your opinions?Thanks

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