Speed up `dub`.

[Daniel Kozak via Digitalmars-d-learn]

I would say dub is broken and should be fixed. Even dub run is really 
slow and try to build everything. So please report a bug: 
https://github.com/D-Programming-Language/dub/issues

Dne 7.3.2016 v 19:58 ciechowoj via Digitalmars-d-learn napsal(a):
> dub --version
> DUB version 0.9.24+161-gb9ce700, built on Feb 23 2016
>
> `dub.json` is `dub.json` of dstep
>
> `dub test --skip-registry=all`
> Do not helps.