Cookiejar implementation.

[dgrr]

Hello,

This commit tries to implement a basic CookieJar structure to handle Cookies easily without using external packages.

[erikdubbelboer]

I think if we're going to add a CookieJar we should do it right and follow the spec. So:

1. Which cookies are returned should be based on the path as well.
2. Cookies should expire based on their expire time
3. You can't set cookies for TLDs (for this you need a public suffix list, I suggest making this optional)

[efectn]

Any progress?

[erg43hergeg]

bump