Improved Javadocs of the getList() methods.

The Javadoc of the original getList() method was misleading; it did not mention
that the result list could contain complex object. This was corrected. It was
also tried to describe the differences between the different getList() methods.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1516570 13f79535-47bb-0310-9956-ffa450edef68
Added a property for the date format to DefaultConversionHandler.

This format string specified here will be used for conversions to Date or
Calendar objects.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/configuration/trunk@1516571 13f79535-47bb-0310-9956-ffa450edef68