Merge pull request #101 from sdeleuze/master

Exception handler documentation
Merge pull request #102 from sdeleuze/master

Update documentation before 2.1.0-rc1 release
fix links and tutorial answers
Merge pull request #103 from bclozel/master

Fix spring documentation before 2.1.0-rc1 release
main.js belongs to framework - application lives in app.js
Merge pull request #104 from bclozel/master

main vs app
Add Sluggable controller title