revert broken parts of cdde576182

Thanks @alagopus.

lib/coffee-script/coffee-script.js

@@ -51,8 +51,7 @@
       if (options.filename) {
         err.message = "In " + options.filename + ", " + err.message;
       }
-      console.error(err.message);
-      process.exit(1);
+      throw err;
     }
     header = "Generated by CoffeeScript " + this.VERSION;
     return "// " + header + "\n" + js;

src/coffee-script.coffee

@@ -40,8 +40,7 @@ exports.compile = compile = (code, options = {}) ->
     return js unless options.header
   catch err
     err.message = "In #{options.filename}, #{err.message}" if options.filename
-    console.error err.message
-    process.exit 1
+    throw err
   header = "Generated by CoffeeScript #{@VERSION}"
   "// #{header}\n#{js}"