add currectPage, make buildArticles could specific page, and detect last user article block
add currectPage, make buildArticles could specific page, and detect last user article block

liam-lai/ptt-alertor,meifamily/ptt-alertor,meifamily/ptt-alertor,meifamily/ptt-alertor,liam-lai/ptt-alertor,liam-lai/ptt-alertor,liam-lai/ptt-alertor,meifamily/ptt-alertor