Cookie file support

[snshn]

127.0.0.1   FALSE   /   FALSE   0   USER_TOKEN  in

7 tab-separated fields: domain, tailmatch, path, secure, expires, name, value.

[snshn]

Resolves #55

[Phrynobatrachus]

Nice, I was looking at this too recently. One small note from wget is that they also check the port:

https://github.com/mirror/wget/blob/9a35fe609c87c558153cff80fef7dea809b3cf63/src/cookies.c#L1220-L1221

Thanks for merging!

[snshn]

@Phrynobatrachus it's tricky, https://stackoverflow.com/questions/1612177/are-http-cookies-port-specific claims that port is not relevant;