Modify flickr verifier

Hi,

Flickr seems to make a change that a redirect page is put between sign-in and authorization page, so the verifier fails.

Redirect page: 
```html
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script language="JavaScript">
<!--
window.location.replace("http://www.flickr.com/signin/yahoo/?redir=%2Fservices%2Foauth%2Fauthorize%3Fperms%3Ddelete%26oauth_token%3Dxxxxxxxxxxxxx-xxxxxx&.data=...");
// -->
</script></head></html>
```

Additionally, I found some mistakes in README.