Issue #236:
removed html tags from all views.
it doesn't work on close question answer view..

Issue #237
removed hr, imgs, double br and empty p
to be done: remove preceding and trailing br
Issue#237
added hidden html element that will be used for the cleaning of html tags in the question pool model 

Issue #236
added hidden html element that will be used for the cleaning of html tags in the question pool model
#237, #236
set the visibility of the  hidden html element
corrected a sanity check on feedback text length