Wowhead screenshots for Items & NPCs

Screenshots are loaded using ajax.
You should create 'wowhead' folder in 'cache' folder, it's used to for
cache.
Delete private folder
Small fix for the screenshot parser
Tiny commit
Fix for screenshot feature

+ Now uploaded screenshots do not result in JS errors if wowhead
screenshots are available.
+ Icon to show that the image is from wowhead
Merge pull request #1 from celguar/master

Merge "Master" of https://github.com/celguar/Freehead