Add graffiti-no-oclosure for the tutorial
Add rules for ojw_color_picker in graffiti's stylesheet
Update application tutorial to remove O'Closure
Update chapter 3 to match the content of the latest version of Graffiti-Extended
Add a warning at the root of chapter1 and chapter3 code
Add proper compilation tools for chapter 2
Merge pull request #13 from Engil/master

Update application tutorial to remove O'Closure and use Ojwidgets instead