merging node into master -- you can now pass the --narwhal flag to use narwhal instead. All tests are executing successfully against both Node.js and Narwhal/Rhino backends

src/coffee-script.coffee

@@ -0,0 +1,45 @@
+# Executes the `coffee` Ruby program to convert from CoffeeScript to JavaScript.
+path: require('path')
+
+# The path to the CoffeeScript executable.
+compiler: path.normalize(path.dirname(__filename) + '/../../bin/coffee')
+
+
+# Compile a string over stdin, with global variables, for the REPL.
+exports.compile: (code, callback) ->
+  js: ''
+  coffee: process.createChildProcess compiler, ['--eval', '--no-wrap', '--globals']
+
+  coffee.addListener 'output', (results) ->
+    js += results if results?
+
+  coffee.addListener 'exit', ->
+    callback(js)
+
+  coffee.write(code)
+  coffee.close()
+
+
+# Compile a list of CoffeeScript files on disk.
+exports.compile_files: (paths, callback) ->
+  js: ''
+  coffee: process.createChildProcess compiler, ['--print'].concat(paths)
+
+  coffee.addListener 'output', (results) ->
+    js += results if results?
+
+  # NB: we have to add a mutex to make sure it doesn't get called twice.
+  exit_ran: false
+  coffee.addListener 'exit', ->
+    return if exit_ran
+    exit_ran: true
+    callback(js)
+
+  coffee.addListener 'error', (message) ->
+    return unless message
+    puts message
+    throw new Error "CoffeeScript compile error"
+
+
+
+