JavaScript transpiler to Node-compatible CommonJS

 Commoner makes it easy to write scripts that flexibly and efficiently
 transpile any dialect of JavaScript into a directory structure of
 Node-compatible CommonJS module files.
 .
 This task is made possible by
  1. a declarative syntax for defining how module source code should be
     found and processed,
  2. the use of [promises](https://github.com/kriskowal/q) to manage an
     asynchronous build pipeline, and
  3. never rebuilding modules that have already been built.
 .
 The output files can be required seamlessly by Node, or served by any
 static file server, or bundled together using a tool such as
 Browserify, WrapUp, or Stitch for delivery to a web browser.