[mlpack-git] mlpack-2.1.x's head updated: Merge branch 'master' into mlpack-2.1.x (c88518c)

[gitdub at mlpack.org]

Repository : https://github.com/mlpack/mlpack
Branch 'mlpack-2.1.x' now includes:

     921ff50 Set to minimum possible score.
     74c07da Fix incorrect error conditional.
     91564ff Fix serialization bug.
     c88518c Merge branch 'master' into mlpack-2.1.x