remove ew_accents and update to new version

ew_accents has been moved to eliom-widgets
and removeDiacritics had been added to
Ojwidgets
add more errors log on crop popup
update font-awesome
update jquery.js
add reset function in eba_cache
fix typing error in eba_cache
use eba_cache instead of old cache system
remove verbose from Makefile in samples dir
add had and set functions in eba_cache module
add cache for eba_groups
cosmetic