New features:
- Use flags to specify input template, JSON data, output file paths, and template name tokens... other than stdin/argv[1]/stdout/".tmpl"
- Use environment variables instead of flags
- Accept directories of input templates to render to a corresponding file in the output directory, retaining permissions, stripping
.tmplfrom the names, and ignoring all else - Perform concatenation of rendered input templates when rendering many inputs to only one output file or stdout
- Have usage info when called with no args or env vars or with
-hor--help.