Continuation of Postal

Postal (at least in this repository) is no longer actively maintained (last release sept 2014) and is not accepting any new PR's. My initial thought was forking it and maintaining Postal myself.
Luckily some users already started doing this.
I see at least two active forks at the moment; [hermanho's](https://github.com/hermanho/postal) and [John Harman's](https://github.com/Jmaharman/postal/network)

Both these forks have much needed features like [.Net Core](https://github.com/andrewdavey/postal/issues/156) support and [layout support outside of MVC](https://github.com/andrewdavey/postal/pull/117). However these features are not available in all forks and make for some fragmentation, these forks also have no published packages (as far as I'm aware) making them hard to use.

I'm using John Harman's fork because I've needed layouts outside of MVC, but using this was a pain because I needed to create a private package myself.

@andrewdavey , @hermanho and @JmaHarman
I wanted to open the discussion about the continuation of Postal.
Merge different forks into a singular maintained Postal and start accepting PRs again.

What are your thoughts/ideas for continuation of Postal?