fix(makefile): delete missing files on rsync

fixes problems seen while working with schema migrations
fix(tests): allow env vars to override important test settings
refactor(tests): update test expectations and get suite passing
docs(tests): update README.md with integration test setup
fix(contrib/digitalocean) fix region check

Fix the allowed region checks.
This used to only allow 4 (New York 2), and not any of the others.
Merge pull request #1503 from nathansamson/do-fix

fix(contrib/digitalocean) fix region check
Merge pull request #1492 from deis/fix-rsync-delete

fix(makefile): delete missing files on rsync
style(controller): flake8
Merge pull request #1497 from deis/integration-test-fixes

fix(tests): integration improvements and documentation
docs(README): typo - `ram`
fix(controller): Determine registry address during start

Before this change re-deploying apps failed when the registry was
re-scheduled to a different instance in the cluster.

Fixes #1128
Merge pull request #1508 from deis/flake8-fixes

style(controller): flake8
Merge pull request #1325 from johanneswuerbach/moving-registry

fix(controller): Determine registry address during start
fix(controller): remove /run/deis/determine_registry

This script is backwards-incompatible with existing clusters. Moving the
calls to etcd directly into the unit file removes the dependency and
ultimately makes master backwards-compatible again.
Merge pull request #1512 from deis/remove-determine-registry

fix(controller): remove /run/deis/determine_registry
feat(controller): add endpoint and infrastructure for limiting memory/cpu
feat(client): add commands for managing memory/cpu limits
fix(controller): tack on host/port to image id

With the changes to how we store images in the controller, we stripped
the host/port from the image. We must add it back if we want to pull
it from the registry.
Merge pull request #1517 from deis/hotfix-apps-run

fix(controller): tack on host/port to image id
tests(integration): add check for systemd unit file droppings