Now a more general findBlogPosts(), which simplifies the webscript implementation slightly & removes possibility of an UnsupportedOperationException.
Also added new test case that finds before/after/within specified date ranges.
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@28988 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261