-Model redefined and revised.
-New version in js libraries + fix in sliders adapted to v4 of bxslides

-TODO: Tests + Data initialization
New JQuery and JQuery-UI version to fix some buttons in login screen.
New style to modal login screen
Merge branch 'feature/bbdd' into develop

Conflicts:
	app/views/devise/shared/_links.erb
Fix in devise links broked in the last merge.