Using
<meta http-equiv="Refresh" content="1; URL=http://example.com/">
in a HTML message causes WebView to load the URL in the default browser.
Overriding WebViewClient.shouldOverrideUrlLoading() allows us to cancel
loading this URL. Sadly, I found no way to find out whether the method was
called because of a meta refresh or because the user clicked on a link.
So now we're using HtmlCleaner to parse the HTML and remove all "meta" elements
containing an "http-equiv" attribute with a value of "refresh".
Reverts changes introduced with commit 8194c20ffeb31e2da304f3436b95f7291d013392
Adds test to make sure usernames/passwords with special characters encode/decode properly.
