Fix handling a port number in URI

[ksugar]

Properly handle a URI with port number.
The constructor that takes the authority needs one more argument.

// With previous implementation, this constructor is called
    public URI(String scheme, String host, String path, String fragment)
        throws URISyntaxException
    {
        this(scheme, null, host, -1, path, null, fragment);
    }

// With this PR, this constructor is called
    public URI(String scheme,
               String authority,
               String path, String query, String fragment)
        throws URISyntaxException
    {
        String s = toString(scheme, null,
                            authority, null, null, -1,
                            path, query, fragment);
        checkPath(s, scheme, path);
        new Parser(s).parse(false);
    }

[cmhulbert]

Thanks for this, that is a frustrating constructor issue, nice catch.
Do you have a small test that could verify the behavior? I'm happy to accept this now, since I think this is a true bug, but it would be nice to have a test to avoid a regression in the future.

[ksugar]

@cmhulbert thanks for the review. I sent another PR for the test.
#30