Get rid of include directives inside namespace blocks (bug #339).

unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h

@@ -28,6 +28,8 @@
 
 #include "StemFunction.h"
 
+namespace Eigen { 
+
 #if defined(_MSC_VER) || defined(__FreeBSD__)
   template <typename Scalar> Scalar log2(Scalar v) { using std::log; return log(v)/log(Scalar(2)); }
 #endif
@@ -462,4 +464,6 @@ const MatrixExponentialReturnValue<Derived> MatrixBase<Derived>::exp() const
   return MatrixExponentialReturnValue<Derived>(derived());
 }
 
+} // end namespace Eigen
+
 #endif // EIGEN_MATRIX_EXPONENTIAL