prepare version 0.5
Bugfix: Invalid links in wrapped content, if pretty URL's are disabled

The links inside the wrapped content do not work, if pretty URL's are disabled in CMS made simple.
see CMSms-Wiki about Pretty URL's: http://docs.cmsmadesimple.org/configuration/pretty-url)
fixed incorrect link to changelog
add management script for the creation of ZIP release archives
Finish v0.5