Backwards-incompatible changes from 0.4.x to 1.0.x:

* RFC 2965 is now off by default.

* AbstractHTTPHandler (hence all HTTP functionality) now uses
  httplib.HTTPConnection instead of httplib.HTTP.  This means that
  ClientCookie now claims to be an HTTP/1.1 client instead of 1.0.
  Same goes for HTTPS.

* CookieJar now knows nothing about files.  If you want to write
  cookies to a file, and don't need to use a browser-compatible file
  format, use LWPCookieJar.  CookieJars that know about files now
  derive from FileCookieJar.

* FileCookieJar.load(), .revert() and .save() now raise LoadError in
  addition to IOError.

* CookieJar.cookies attribute is now private.

* Renamed ClientCookie.Request.iter_headers() to .header_items().

* Request.unverifiable and .origin_req_host are now private,
  replaced by methods .get_unverifiable() and .get_origin_req_hoot().
  The constructor now has arguments to set these attributes.  Some old
  code still returns urllib2.Request objects: in that case, set
  these attributes directly on the urllib2.Request, and
  RequestUpgradeProcessor will carry them over when upgrading them to
  ClientCookie.Request objects (yuck).

* Cookie.rest is now private: use has_nonstandard_attr(),
  get_nonstandard_attr() and set_nonstandard_attr() instead.