Fix compilation with gcc-4.9
Looks like one needs to include <functional> if one uses std::function. Compilation verified with: * gcc-4.8 * gcc-4.9 * clang-3.2
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15aa971a
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Looks like one needs to include <functional> if one uses std::function. Compilation verified with: * gcc-4.8 * gcc-4.9 * clang-3.2