[mlpack-git] [mlpack/mlpack] Vantage point tree (#708)

[Ryan Curtin]

Performance is better now:
```
$ bin/mlpack_knn -r ~/datasets/corel.csv -v -k 3 -t vp --single
[INFO ] 188080778 node combinations were scored.
[INFO ] 965686362 base cases were calculated.
```

That's about 75% as many base cases.  Unfortunately when I use dual-tree search, there are some duplicates in the results (this is probably why the test is failing for range search, too).

But I still think we have a long way to go---vp-trees should be competitive with kd trees (or at least R trees!).

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