index: update list of TLDs

Re-ran `update.js` to re-scrape Wikipedia.
update: rewrite to use domains list from ICANN

This list appears to be more up-to-date than Wikipedia.
index: update using list from ICANN
Readme: change from Wikipedia -> ICANN
Readme: fix "scraped" typo
update: use "punycode" module to decode the unicode URLs
index: update with decoded unicode entities
Merge pull request #2 from Automattic/update/use-list-from-icann

Use list from ICANN