Cache filename error with | "pipe" characters

[Sam Ruby]

Harry Fuecks wrote:
> 
> Was able to fix it by changing line 14 in spider.py from;
> 
> re_slash         = re.compile(r'[?/:]+')
> 
> to;
> 
> re_slash         = re.compile(r'[?/:|]+')

Thanks!

- Sam Ruby