* Added support for 'spartan' shell environments. These are defined to be environments that expose global print() and load() functions, and that expose command-line arguments on top-level Arguments array. This now works for spidermonkey (Mozilla), jsc (Webkit), and v8 (Chrome) implementations. v8 must be patched to expose command-line arguments as top-level Arguments array. Rhino can also be considered a spartan shell environment.
* Improved logger module to accept multiple arguments, like console.log.
* Added quit() module for node, rhino, and spartan shell environments.