Merge branch 'development'

Merging development branch.
Restricted the access to current JuniFEUP elements. Removed some screenshots from the readme
Changed the style of the sign in form
Changed the style of the sign up form
Redirects to the ideas list page if the sign up is valid, and solved bug where it would allow the registration of a email that was already in use.
Merge branch 'master' into development
added one-pagescroll to make a beautiful help page