Include Fuzzy XML parser

Currently some servers return XML content with text/plain content type.

The current solution is: parse text/plain as xml (which is a very bad solution).

The better solution would be:

Check if content is XML (by analysing if it starts with "<xml") and then rewrite the content-type
Unused method argument - `options`. If it's necessary, use `_` or `_options` as an argument name to indicate that it won't be used.