Import new build-tools instead of changing tools/README.md#3546

Merged

bboreham merged 3 commits intoweaveworks:masterfrom dholbach:drop-email2

Jan 10, 2019

+102-25

Commits on Jan 8, 2019

revert change, pull in subtree update in next step
Daniel Holbach
committed
Squashed 'tools/' changes from 2bbc9a08..ec369f58
Daniel Holbach
committed
Merge commit '5e3c8ab35850163674a069eb8f02cb0e7509b163' into drop-email2
Daniel Holbach
committed