Fix of UnicodeDecodeError on unicode header name that can be converted to ascii.
Deleted is_py2 check from unicode_header_name fix thanks to Lukasa.
Merge pull request #1181 from denis-ryzhkov/master

Fix of UnicodeDecodeError on unicode header name that can be converted to ascii.
Dispatch hooks before following redirects

Fixes #1183
Merge pull request #1185 from sigmavirus24/fix_hook_dispatching

Dispatch hooks before following redirects
Allow RequestsCookieJar to be updated with cookies from a CookieJar
Remove ability to from RequestCookieJar __getitem__, __setitem__ to use cookies as keys
Merge pull request #1194 from gazpachoking/cookiejar_update

Allow RequestsCookieJar to be updated with cookies from a CookieJar