Add some more documentation.
Add some more documentation.

palashahuja/mlpack,palashahuja/mlpack,theranger/mlpack,ajjl/mlpack,ranjan1990/mlpack,ranjan1990/mlpack,darcyliu/mlpack,stereomatchingkiss/mlpack,darcyliu/mlpack,theranger/mlpack,ajjl/mlpack,theranger/mlpack,palashahuja/mlpack,stereomatchingkiss/mlpack,stereomatchingkiss/mlpack,ajjl/mlpack,darcyliu/mlpack,ranjan1990/mlpack