pushstream.js Utils.isCrossDomainUrl bugfix for IE

[arusakov]

Hi, wandenberg

Current code for parsing url:

var parser = document.createElement('a');
parser.href = url; 

If url does not contains port, for example "http://test.com", IE behaves differently then other browsers.

Browser	location.port	parser.port
Chrome 39	''	''
Firefox 34	''	''
Opera 12.16	''	''
IE9	''	'80'
IE 11	''	'80'

normalizePort() fix that for http and https protocols.

[wandenberg]

Merged with small changes. Thanks