Improve fastly detection (#1867)
Improve fastly detection (#1867)

This can be checked [here](http://www.sxcurity.pro/2017/11/27/tricky-CORS/)
WPO-Foundation/Wappalyzer,WPO-Foundation/Wappalyzer,AliasIO/wappalyzer,WPO-Foundation/Wappalyzer,AliasIO/wappalyzer