Dear Navdeep,
To start with, sorry we have not responded to your issue. However, I want to say that Dedalus is most certainly being actively maintained and used by a large community.
There is a combination of two things leading to our slower response times. First, we have in the past typically dealt with questions like this on the mailing list rather than via github issues, and second, the development team is currently in the midst of a major push for a new, v3 release. If you look at the github repo, you'll see that under the d3 branch, there is a lot of major activity.
thanks for your patience,
Jeff