* adjust code.
Merge branch 'master' of github.com:xirang/chanzhieps
 * add boards in sitemap.html.
 * adjust code.
 * adjust code.
 * adjust code.
 * adjust the style for summary in create article page.
 * add summary and keywords in view page.
 * add keywords and summary.
 * adjust code.
 * adjust book function.
 * add getBookTreeMenu and createHelpBook function to show the book.
 * user getBookTreeMenu function to get tree and articles of book.
Merge branch 'master' of github.com:xirang/chanzhieps