Furl v1.1

• Fixed: Support and preserve all query strings as provided. For example, preserve
  the query &&== of http://foo.com?&&== as-is. Empty key=value pairs are
  stored as ('', None) in Query.params, e.g. [('', None), ('', None)] for the
  query &.
• Changed: Don't encode equal signs (=) in query values if the key is empty.
  That is, allow and preserve queries like ?==3== while also percent encoding
  equal signs in query values with an associted key, as expected. E.g.
  ?a=1%3D1.