[issue2211] Cookie.Morsel interface needs update

[Jamie Bliss]

Jamie Bliss added the comment:

* Should be backwards compatible with people who actually use Morsel
* Didn't even attempt to document it
* Instead of having the Morsel dict being filled initially, unset
attributes are, well, unset
* .key, .value, and .coded_value are now property()s
* .value is considered the actual value (eg, .coded_value is ignore for
__eq__())

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Tracker <report at bugs.python.org>
<http://bugs.python.org/issue2211>
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