call updateTasks from shiny; add checkbox hide stopped; fix root malfunction issue; add task_proxy to update download list; use reactivePoll to refresh download list every 5 sec.
call updateTasks from shiny;
add checkbox hide stopped;
fix root malfunction issue;
add task_proxy to update download list;
use reactivePoll to refresh download list every 5 sec.

gahoo/ross,gahoo/ross