Merge pull request #63 from chrqls/dev

[#39] Fixing a bug when loading an iqset. Start_Make question step added
[#39] 'Quit' button appears
[#39] Fixing bug about dupplicate questions
[#39] Sections managed by the 'smile' attribute
Merge commit '41943fb' into dev
[#39] Upgrading design(in progress), reseting questions when leaving, and cleaning code
[#39] Adding tabs for the board, designing list of iqsets
[#39] Previewing an IQSet instead of a list of questions. And so? we can display the title and the date of the iqset. Preparing stuff for student list