docs: function RunnerContext(argv, config, env) {
    argv.tasks = argv._.length ? argv._ : ['default'];
    this.argv = argv;
    this.config = config;
    this.env = env;
    this.json = loadConfig(this.argv.cwd, this.env);
    this.pkg = loadPkg(this.argv.cwd, this.env);
    this.pkgConfig = this.pkg[env.name] || {};
    this.options = merge({}, this.pkgConfig.options, this.json.options);
  }