updated with new features

[eelsivart]

-- Changed wkhtmltoimage-i386 to wkhtmltoimage to reflect the new name in new version -- Added ability to take script args to adjust format type and quality level. -- Added default behavior to create an index.html preview file or specify name -- Added additional checks for open ports before running -- Added verbose status output -- script-args: -- http-screenshot.format = jpg, png, etc (default is jpg) -- http-screenshot.quality = 0-99 (default is 75) -- http-screenshot.indexpage = file.html (default is index.html)