Normalize the URL path
Applies Syntax-based normalization to the URL path.
Percent-encoding triplets are normalized to uppercase letters. Percent-encoded octets that correspond to unreserved characters are decoded. Redundant path-segments "." and ".." are removed.
assert( url( "http://www.example.com/a/b/../c" ).normalize_path().buffer() == "http://www.example.com/a/c" );
assert( url( "http://www.example.com/a/./b" ).normalize_path().buffer() == "http://www.example.com/a/b" );
assert( url( "http://www.example.com/%63ss" ).normalize_path().buffer() == "http://www.example.com/css" );
Strong guarantee. Calls to allocate may throw.
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