Cookie handling is all over the place

[Jaymon]

Requests uses CookieJar but Selenium uses its own dict format. But since I added Selenium first I standardized on their format for brow.core.Cookies but I think it would be better to switch this and standardize on CookieJar because then I can use Python's built-in stuff like FileCookieJar to cache the cookies instead of the custom pickle solution I have now.

Maybe helpful links about cookies:
https://stackoverflow.com/questions/1969232/allowed-characters-in-cookies
https://docs.python.org/2/library/cookie.html (the other python Cookie lib)