[mlpack-git] [mlpack/mlpack] Implementation of Multiprobe LSH (#691)

[Yannis Mentekidis]

>    for (size_t i = 0; i < hashVec.n_elem; i++)
>      hashVec[i] = (double) ((size_t) hashVec[i] % secondHashSize);
>  
>    Log::Assert(hashVec.n_elem == numTablesToSearch);
>  
> +  // Compute hashVectors of additional probing bins
> +  arma::mat hashMat;

**On your first point:** I wondered too when I first saw this - I thought it had something to do with operator precedence but [typecasting precedes modding](http://en.cppreference.com/w/c/language/operator_precedence), so I'm fixing that.

**On your second point:** In the beginning I started doing it like that to avoid the copy, but the armadillo spans confused me so I went around it. I'll try to find a way to do it the way you say.

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