Fix verbose usage

`node_modules/.bin/node-qunit-phantomjs --verbose test/index.html` (i.e. verbose option first) results in the following error:

    path.js:327
            throw new TypeError('Arguments to path.resolve must be strings');
                  ^
    TypeError: Arguments to path.resolve must be strings
        at Object.exports.resolve (path.js:327:15)
        at module.exports (.../node_modules/node-qunit-phantomjs/index.js:14:29)
        at Object.<anonymous> (.../node_modules/node-qunit-phantomjs/bin/node-qunit-phantomjs:14:36)
        at Module._compile (module.js:449:26)
        at Object.Module._extensions..js (module.js:467:10)
        at Module.load (module.js:349:32)
        at Function.Module._load (module.js:305:12)
        at Function.Module.runMain (module.js:490:10)
        at startup (node.js:123:16)
        at node.js:1128:3

I'm not entirely sure what's going on, except that apparently the argument parsing within the executable goes wrong.