Add middlewares, favicon and put app in lib

Add the following middlewares :
- methodOverride
- expressSession
- serveStatic
- serveIndex
- errorhandler
Merge branch 'master' of https://github.com/adejacques/AST_myApp into adejacques-master
Merge with alexandre and lauren
Merge branch 'adejacques-master'
Merge Branch master