Added _getSurveyRecordFor method to Survey View. This method is used by the Take view to get the right SurveyRecord for the current request. Subclassed Views that want to fetch their records in another way can override this method.

#!/bin/sh
NOSE_WITH_DOCTEST=t
export NOSE_WITH_DOCTEST
NOSE_DOCTEST_EXTENSION=txt
export NOSE_DOCTEST_EXTENSION
#NOSE_DETAILED_ERRORS=t
#export NOSE_DETAILED_ERRORS
nosetests $*