function loadTasks(relPath) {
    return includeAll({
      dirname: require('path').resolve(__dirname, relPath),
      filter: /(.+)\.js$/,
      excludeDirs: /^\.(git|svn)$/
    }) || {};
  }
Loads Grunt configuration modules from the specified
relative path. These modules should export a function
that, when run, should either load/configure or register
a Grunt task.