Improved development server

Fauton: Much faster and simpler build server. Only updates changed files, uses
requirejs to load necessary dependancies.

Fixes COUCHDB-1846
Copy preliminary 1.4 changelog items to docs.
Mention docs in README, call out changelog.
Remove NEWS and CHANGES files, in favor of docs.
fix configure, CHANGES is no more
remove more build-system traces of NEWS & CHANGES