Adding a QRCode with the user's information

QRCode retrieved from Google APIs, and parsed with json like that:
{address:"",user:"",key:""}
double bracket on user id and token

for the qrcode
fix survey migration
Merge pull request #1061 from MagicMicky/develop

Adding a QRCode with the user's information
Merge branch 'develop' of github.com:lefnire/habitrpg
grammar