Really support compiled_package_cache for local vms
Rename remote.vm.box to bosh-lite-ubuntu-trusty
Update uploading of boxes to S3

Instead of both ci-local-box-build and ci-box-bats uploading boxes, only
ci-box-bats uploads the box.

Additionally, the box is now uploaded to /bosh-lite-build-artifacts/
directly instead of into a subfolder.