Merge pull request #60 from lrowe/master

Ignore socket.error following StopableWSGIServer.shutdown.
Correctly handle <option> elements with no value attribute

E.g. http://www.w3.org/TR/REC-html40/interact/forms.html#edef-OPTION
clearly states that the value attribute of OPTION elements "defauls to
element content".
Merge pull request #61 from mgedmin/options-without-values

Correctly handle <option> elements with no value attribute
changelog update
Preparing release 2.0.4
Back to development: 2.0.5
That should have been select.error.