Add a tab to show post that we did answer

DiscussionsController : 
		add a join and group by if the type is "answers"
		add the type "answers" 

list-post.volt :
		Add the tab "answers"

.gitignore : add netbeans dir
Merge branch 'master' of git://github.com/SneakyBobito/forum into SneakyBobito-master

Conflicts:
	.gitignore
	app/controllers/DiscussionsController.php