Raw params data send

Sometimes it's necessary to have ability to send raw parameters with get request. (especially in testing)

By default there going to be no changes, except fix:
for parameters that were going in url, like, http://h.wrttn.me?key=value, key and value weren't encoded
but now they are, look in tests.

For send a raw request, without url encoding, just need to pass a encode_url=True arg to Request.