try to fix tailf got nothing on Chrome

I have tested Chrome behavior about chunked response. The `Content-Type` should be `text/html` and response content must be a valid html element format, so I wrapped every log row in a `p` element, it is not very beautiful, but it works for me. 

My Chrome Version is 35.0.1916.153 (Official Build 274914) on MacOS.

Here is my test chunked response code, a piece of nodejs code.
```javascript
var http = require('http');

http.createServer(function (request, response) {
    response.writeHead(200, {
        'Content-Type': 'text/html',
        'Transfer-Encoding': 'chunked'
    });
    var x = setInterval(function(){
        response.write('<p>' + new Date() + '</p>' + '\r\n'); 
    }, 1000);
}).listen(8000);
```