Merge pull request #59 from chrqls/dev

[#39] Updating web client for teacher
[#39] Adding the session values in /smile/all
[#39] Synchronizing session values with android app, upgrading the question list, cleaning, commenting
[#39] Major update on the ability of the webapp to adapt the page depending on what /smile/all returns
[#39] Removing recovering button
[#39] Adding detail of a question
[#39] Back button synchronize with server
[#39] Cleaning and commenting code
Merge commit 'af1f233' into dev