Fix tagged builds on CircleCI (mapbox#3225)

* Fix circle tagged build

* improve docs

Reorganize CI scripts, fix CI deploy script

* ensure deploy.sh works

* Further refinements to CI setup

* Fix file permissions

* Move cloudformation folder

* test

* Rejigger upload paths

* Undo path changes

* Fix bug in deploy script

* Simplify deploy scripts

* Re-enable tests

* Fix script error

Fix script error