Remove a unnecessary uri
Fix "Video - Vimeo" Extractor

Close #35
utility.js: Add downloadWithReferrer()
Fix "Photo - ITmedia" Extractor
"Share - Photo" should be able to post pixiv image to services #33

* Add pixiv image URL RegExp to Extractors.Photo.PROTECTED_SITES

Photo Extractor should handle pixiv image.
But, Photo Extractor does not always get original pixiv image.
The feature should be dream come true by pixiv Extractor.