add tests for Filter() and Not()
add tests for Filter() and Not()

tjyang/goquery,yinzhiqiang/goquery,matrixik/goquery,qida/goquery,cmars/tools,ASAPPinc/goquery,cmars/tools,daemonchen/goquery,legendtkl/goquery,mantyr/goquery,treejames/goquery,daemonchen/goquery,PuerkitoBio/goquery,zhangheli/goquery,mantyr/goquery,jjz/goquery,ASAPPinc/goquery,yinzhiqiang/goquery,zhangheli/goquery,jjz/goquery,legendtkl/goquery,qida/goquery,daemonchen/goquery,qida/goquery,legendtkl/goquery,tjyang/goquery,yinzhiqiang/goquery,PuerkitoBio/goquery,cmars/tools,ASAPPinc/goquery,treejames/goquery,tjyang/goquery,treejames/goquery,jjz/goquery,zhangheli/goquery,cmars/tools