set reasonable SERVICE_VARIANT based on command line; ensure theme passed to coffeescript also;
remove theme_paths var, per @sefk
fix class var; set SERVICE_VARIANT to lms by default if unset (helps "paver --help" work cleanly)
Merge pull request #3094 from yarko/yarko/fix-paver-env-assets

ensure SERVICE_VARIANT set; pass theme to coffeescript;