[mlpack] [mlpack/mlpack] Clear example for compiling example programs (#815)

[Tony Reina]

I followed Alex's apt-get commands and it seemed to install for me on Ubuntu 16.04.

I took the example file and tried to compile it just like Alex compiled nnserach.cpp:

`// Includes all relevant components of mlpack.
#include <mlpack/core.hpp>
// Convenience.
using namespace mlpack;
int main()
{
  // First, load the data.
  arma::mat data;
  // Use data::Load() which transposes the matrix.
  data::Load("data.csv", data, true);
  // Now compute the covariance.  We assume that the data is already centered.
  // Remember, because the matrix is column-major, the covariance operation is
  // transposed.
  arma::mat cov = data * trans(data) / data.n_cols;
  // Save the output.
  data::Save("cov.csv", cov, true);
}
`

However, it is giving me lots of errors about not finding declarations:
`gcc mlpackTest.cpp -o mlOutTest -lboost_serialization -larmadillo -lmlpack
In file included from /usr/include/c++/5/unordered_map:35:0,
                 from /usr/include/mlpack/core/boost_backport/unordered_map.hpp:23,
                 from /usr/include/mlpack/prereqs.hpp:64,
                 from /usr/include/mlpack/core.hpp:196,
                 from mlpackTest.cpp:2:
/usr/include/c++/5/bits/c++0x_warning.h:32:2: error: #error This file requires compiler and library support for the ISO C++ 2011 standard. This support must be enabled with the -std=c++11 or -std=gnu++11 compiler options.
 #error This file requires compiler and library support \
  ^
In file included from /usr/include/mlpack/prereqs.hpp:64:0,
                 from /usr/include/mlpack/core.hpp:196,
                 from mlpackTest.cpp:2:
/usr/include/mlpack/core/boost_backport/unordered_map.hpp:98:16: error: ‘unordered_map’ in namespace ‘std’ does not name a template type
     const std::unordered_map<
                ^
/usr/include/mlpack/core/boost_backport/unordered_map.hpp:98:29: error: expected ‘,’ or ‘...’ before ‘<’ token
     const std::unordered_map<
                             ^
/usr/include/mlpack/core/boost_backport/unordered_map.hpp: In function ‘void boost::serialization::save(Archive&, int)’:
/usr/include/mlpack/core/boost_backport/unordered_map.hpp:105:9: error: ‘unordered_map’ is not a member of ‘std’
         std::unordered_map<
         ^
/usr/include/mlpack/core/boost_backport/unordered_map.hpp:105:9: error: ‘unordered_map’ is not a member of ‘std’
`

It seems to be finding the includes, but I have no clue as to what other compile and link flags I need to get things built.

What IDE do you guys use to build projects on Linux? Or, do you just use text editors and CMake.

Thanks.
-Tony



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