moved the coffeescript extension over from .cs to .coffee -- let's leave C# in peace. Changed array comprehensions to always return their mapped result, even when unassigned

lib/coffee_script/narwhal/coffee-script.coffee

@@ -0,0 +1,59 @@
+# This (javascript) file is generated from lib/coffee_script/narwhal/coffee-script.coffee
+
+# Executes the `coffee-script` Ruby program to convert from CoffeeScript
+# to Javascript. Eventually this will hopefully happen entirely within JS.
+
+# Require external dependencies.
+OS:       require('os')
+File:     require('file')
+Readline: require('readline')
+
+# The path to the CoffeeScript Compiler.
+coffeePath: File.path(module.path).dirname().dirname().dirname().dirname().dirname().join('bin', 'coffee-script')
+
+# Our general-purpose error handler.
+checkForErrors: coffeeProcess =>
+  return true if coffeeProcess.wait() is 0
+  system.stderr.print(coffeeProcess.stderr.read())
+  throw new Error("coffee-script compile error").
+
+# Run a simple REPL, round-tripping to the CoffeeScript compiler for every
+# command.
+exports.run: args =>
+  args.shift()
+  return require(File.absolute(args[0])) if args.length
+
+  while true
+    try
+      system.stdout.write('cs> ').flush()
+      result: exports.evalCS(Readline.readline())
+      print(result) if result isnt undefined
+    catch e
+      print(e)...
+
+# Compile a given CoffeeScript file into JavaScript.
+exports.compileFile: path =>
+  coffee: OS.popen([coffeePath, "--print", "--no-wrap", path])
+  checkForErrors(coffee)
+  coffee.stdout.read().
+
+# Compile a string of CoffeeScript into JavaScript.
+exports.compile: source =>
+  coffee: OS.popen([coffeePath, "--eval", "--no-wrap"])
+  coffee.stdin.write(source).flush().close()
+  checkForErrors(coffee)
+  coffee.stdout.read().
+
+# Evaluating a string of CoffeeScript first compiles it externally.
+exports.evalCS: source =>
+  eval(exports.compile(source)).
+
+# Make a factory for the CoffeeScript environment.
+exports.makeNarwhalFactory: path =>
+    code: exports.compileFile(path)
+    factoryText: "function(require,exports,module,system,print){" + code + "/**/\n}"
+    if system.engine is "rhino"
+      Packages.org.mozilla.javascript.Context.getCurrentContext().compileFunction(global, factoryText, path, 0, null)
+    else
+      # eval requires parenthesis, but parenthesis break compileFunction.
+      eval("(" + factoryText + ")")..