entangle: organize code
entangle.each: renamed from entangle.hash
entangle.flow: remove core implementation (use append as flow)
entangle.hash: extract partial function from `fork`
entangle.fork: simplified
entangle.slot: easy fork
entangle.fork: work with slot
navigation.js: refactor
entangle.fork: fix fork to Entangle instance
entangle.app: application framework
navigation.js: refactor
entangle.app.extend: extend app threads
entangle.app.setup: rename from entangle.app.call