Bugfix: compilation error with Intel icpc 14.0, Build 20130728

The following combinations of compilers and STL implementations now
work:

    clang++ 3.4 + STL 4.8.1
    icpc 14.0 + STL 4.6.4 or 4.8.1
    g++ 4.6.4 + STL 4.6.4
    g++ 4.7.2 + STL 4.7.2
    g++ 4.8.1 + STL 4.8.1

Patch: Jae-hyeon