A patch from Shi Jinghai for "Proposal: URL-Generation Changes" https://issues.apache.org/jira/browse/OFBIZ-5312

This patch is for the seo branch you created last night. There's a bug while checking whether a url path is a category url and it's fixed.

Several files are for ofbiz old version and can be removed:
CategoryUrlServlet.java: for /category/ servlet
ProductUrlServlet.java: for /product/ servlet
SeoCatalogUrlFilter.java: I cannot remember why it's here. I guess it's because some method is invisible in old version of CatalogUrlFilter.java, so I copied it here.

jleroux: for now I left those files, I will review more to better understand things before


git-svn-id: https://svn.apache.org/repos/asf/ofbiz/branches/OFBIZ-5312-ofbiz-ecommerce-seo-2013-10-23@1535324 13f79535-47bb-0310-9956-ffa450edef68