[mlpack-git] [mlpack/mlpack] Optimize load csv 00 (#681)

[stereomatchingkiss]

OS : win10
compiler : visual c++ 2015 64bits, install update package2
laptop : Y410P

Build time before using boost::spirit--around 17 minutes
Build time after using boost::spirit--around 29 minutes

both of them do not run tests, some CLI tools have build errors, because the global variable in random.hpp cannot find the symbol(ex : mlpack_cf).

Do not know why the compile time increase so much, although the test cases and CLI use the load functions a lot, but I guess most of them do not need to do mappings, so the function should not need to compile LoadCSV over and over again.

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