Feature/specs 0 4

[Simounet]

Hi there,
I updated this extension to work with the 0.4 version of WebSub. Thanks to #2 .
Let me know if I can do something more.
Have a nice day.

[da2x]

You can also remove the following lines:

pushpress/class-pushpress.php

Lines 253 to 257 in 6e7e28b

	if ( !empty( $_POST['hub_verify_token'] ) ) {
	do_action( 'pushpress_include_verify_token' );
	$hub_vars .= '&hub.verify_token=';
	$hub_vars .= urlencode( $_POST['hub_verify_token'] );
	}

[Simounet]

Thanks to point that missing part. I fixed it. Hope someone will check my PR. :p