punycode.js: replace non-ASCII characters

Keep Node's build system happy, replace non-ASCII characters with their ASCII
equivalents.
Merge pull request #1 from bnoordhuis/replace-non-ascii-chars

Replace non-ASCII characters.
Update qunit-clib submodule.
Merge branch 'master' of github.com:bestiejs/punycode.js

* 'master' of github.com:bestiejs/punycode.js:
  punycode.js: replace non-ASCII characters
Restore a line that was accidentally removed in 1dc8ac012ac5e613848fdc3a113999ad95b55466. Ref. #1.
Add a link to Node’s old punycode.js by Ben Noordhuis.
Tag the v0.1.0 release.

* Use the speedy `RegExp#test` instead of `String#match`. Performance test: http://jsperf.com/string-match-vs-regexp-test
* Make sure `Punycode.toUnicode` doesn’t convert domain names or other strings that don’t start with `xn--`.
* Make sure `Punycode.toASCII` doesn’t convert domain names or other strings that are already in ASCII.
* Add more unit tests.
Tag the v0.1.0 release.

* Use the speedy `RegExp#test` instead of `String#match`. Performance test: http://jsperf.com/string-match-vs-regexp-test
* Make sure `Punycode.toUnicode` doesn’t convert domain names or other strings that don’t start with `xn--`.
* Make sure `Punycode.toASCII` doesn’t convert domain names or other strings that are already in ASCII.
* Add more unit tests.
Merge branch 'master' of github.com:bestiejs/punycode.js

* 'master' of github.com:bestiejs/punycode.js:
  Tag the v0.1.0 release.
Update README now that `punycode` is published on npm. Thanks @reconbot!
Simplify unit tests by only escaping the non-ASCII characters in the test strings. Done using http://mothereff.in/js-escapes.
Cache and re-use regular expressions.
Tag the v0.1.1 release.
Minor whitespace cleanup.
Deprecate the optional boolean `preserveCase` arguments to `Punycode.encode()` and `Punycode.decode()`.
Tag the v0.1.2 release.
Update docdown submodule.
Re-parse API documentation.
Update qunit-clib submodule.
Allow `var platform = require(platform);` consistently in Narwhal, Node.js and RingoJS.