Several bug fixes and other improvements

    - Documented auto-relink option in README.md
    - Added more built-in RPATHs in binding.gyp
    - Improved nodem.js
    - Improved nodem.ci
    - Added auto-relink option to mumps.cc
    - Added auto-relink option to v4wNode.m
    - Refactored core functionality in v4wNode.m
    - test1.js renamed as testSet.js
    - test2.js renamed as testFunction.js
    - test3.js renamed as testNodem.js