Expire old cookies before finding a cookie in CookieManager#add.
Before this fix, CookieManager#add find a cookie, and then expire old cookies,
so the found cookie might be removed before being updated.
Force binary encoding for recent rubies.

Remove chomp!
Move buffer creation into Util module.
Merge remote-tracking branch 'lu/fix-chunked-2.0.0'
Fix tests for 302 redirect
Merge remote-tracking branch 'sh/master'
Fork gem
Rename readme to markdown for github