choo components (#639)

* add components

* example: componentize header

* fix choo SSR

* example: componentize footer

* example: fix footer

* update component cache asserts

* componentize todos

* reorder example dir

* fix example tests

* fix dep check test

* Add garbage collection of unused components

* Apply args when calling identity

* update to new component preview

* update nanocomponent

* fix cache err name

* remove static methods from example

* restore app.emit() function

* public API tests

* offset component cache iteration by 2

* whitelist contents of component folder (#643)

* allow lru number arg

* fix lint typo

example/test.js

@@ -2,7 +2,7 @@ var EventEmitter = require('events').EventEmitter
 var spok = require('spok')
 var tape = require('tape')
 
-var todoStore = require('./store')
+var todoStore = require('./stores/todos')
 
 tape('should initialize empty state', function (t) {
   var emitter = new EventEmitter()
@@ -19,25 +19,6 @@ tape('should initialize empty state', function (t) {
   t.end()
 })
 
-tape('restore previous state', function (t) {
-  var emitter = new EventEmitter()
-  var state = {
-    todos: {
-      idCounter: 100,
-      active: [],
-      done: [],
-      all: []
-    }
-  }
-  todoStore(state, emitter)
-  spok(t, state, {
-    todos: {
-      idCounter: 100
-    }
-  })
-  t.end()
-})
-
 tape('todos:create', function (t) {
   var emitter = new EventEmitter()
   var state = {}