MKS changelog parser do not support time period (incl. patch)

Hello,

in januar i write the MKS support for the maven 1 changelog plugin, see http://jira.codehaus.org/browse/MPCHANGELOG-80

But the old version do not support the time period which will be used in the maven site command to show only the last 30 days. While this parser catch all changes ever the generated xml file will grow and grow (and then it will be crash with an out of memory error). This patch fix this problem.

The fix includes also an adepted junit test tu verfiy this. It works.

Thank you and best regards,
Christoph Jerolimov

Btw: I fill my full data into the project.xml.