I have now tested the XBlock in a Quince Tutor devstack; I was able to install v1.3.0 without issues but still I bumped the requirements and updated the README with instructions how to install and configure the XBlock in a Tutor environment. So we’ve now tagged v1.4.0 and I tested that again in my devstack and it seems to be working fine.
@Rohan if you are still having troubles with it please give me some more information about your setup.