* adjust view function for order.
 * adjust getPairs function to get alias.
 * add order of article.
 * adjust createHelpBook function.
 * adjust getPrevAndNext function to add alias for url.
 * adjust code.
 * adjust the url of preAndNext.
 * adjust the header for rss.
 * add the right for sitemap.
 * create sitemap.xml.
Merge branch 'master' of github.com:xirang/chanzhieps
 * adjust code.
 * add postedDate for category.