updated jquery version
refactoring doc for BS3

and added mainImageClass option
refactoring overlay position
refactoring folders
update dist folder
doc : icons are back
fixed tests links
Cleaning CSS and adapting HTML markup
New header and cleaning HTML markup
doc : added missing arrow icon
New home page and factorization CSS code
updates less files with css origins
less : first shot
removed extra css
doc : less shot 2
doc : repositioning iframes
removed  role="navigation" on <header> for W3C validation
doc : fixed typo
less : fixed comments
fixed overlay positioning