Revert "For Vala 0.12, don't use deprecated string.to_int()."
Revert "For Vala 0.12, don't use deprecated string.to_int()."

This reverts commit be8f7259ddd1dcd558b28ffc0761358e8d49bd48.

This depends upon unreleased changes to Vala, so we'll wait till then.

renatofilho/folks,GNOME/folks,renatofilho/folks2,renatofilho/folks2,renatofilho/folks,renatofilho/folks,renatofilho/folks,pwithnall/folks,GNOME/folks,renatofilho/folks2,pwithnall/folks,GNOME/folks,pwithnall/folks,renatofilho/folks2