expose tinylr so you can use its middleware

there is a rather popular task for static or dynamic web server, so sometimes it's useful to write something like 
```javascript
gulp.task('server', function (cb) {
    try { var app = require('./backend/index');} 
    catch (e) {var app = connect();}
    app = app.use('/', connect.static('dist'))
        .use('/', lr.tinylr.middleware({app: app}));
    require('http').createServer(app).listen(3000, cb);
});
```