Drop pre-1.6 support

[mmiller-max]

Although this seems a bit drastic, I think this will let us tidy up the code significantly. It's become a bit unwieldy and testing/developing is not as seamless as it could be, and it would be good to simplify the code to make maintenance more easy going forward.

[oxinabox]

yep, can always backport changed

[mmiller-max]

How would version numbers work with back porting? Would we need to bump the minor number when dropping pre v1.6 so we could keep incrementing the patch for backports, even though dropping support wouldn't be a breaking change?

[oxinabox]

Yes we would need to do that.
But let's just release 1.0 when we drop pre-1.6 support.
I think it is time