Strip UTF-8 BOM(s) from the front of the user script.
Strip UTF-8 BOM(s) from the front of the user script.

Fixes #1823

Ventero/greasemonkey,HasClass0/greasemonkey,HasClass0/greasemonkey,Ventero/greasemonkey,the8472/greasemonkey,Martii/greasemonkey,Martii/greasemonkey,the8472/greasemonkey