Improve naming
Add CONSTRAINTS_FILE
Tweak naming
Rename TARGET to PREFIX
Rename ROOT_DIR to ROOT
Rearrange options
Update README
Improve naming
Banish the suffix _ANY
Rename CLEAN_REBUILD to REBUILD and restore APP_ prefix
Rename CONSTRAINTS_FILE to CONSTRAINTS
Rename S3_HOST to S3_ENDPOINT
Rename NO_DELETE to NO_CLEAN_PRIVATE_STORAGE
Tweak README
Improve naming
Rewrite usage message
Improve naming
Tweak naming
Reorder options and correct option naming