Add `xpath` support.

[fabiocaccamo]

Related issues: #33 #47

[mo-han]

and also glob please

[fabiocaccamo]

@mo-han could you showing an example of what you would be able to do?

[mo-han]

@mo-han could you showing an example of what you would be able to do?

quite the same as https://github.com/dpath-maintainers/dpath-python