feature(desktop): make columns stick to never have blank spaces

http://stackoverflow.com/questions/19161213/how-to-keep-columns-content-visible-sticky-in-a-3-columns-layout
feature(poll,mobile,desktop): review workflow + add timeline_view

* workflow: the owner can open close retract it's polls
* worklfow: remove reject, submit transitions
* workflow: remove pending state
* add timeline_view in mobile
* remove normal view in mobile
* upgrade setup handler to force timeline_view on poll content type
fix(poll): remove useless