A simple name/value expiring evented asynchronous cache

##Usage

var Cachish = require('cachish')

var cache = new Cachish(300000) //feed a timeout value in msecs, default is 10 minutes

cache.set('itemName', 'hello')

cache.get('itemName').then(function (value) {
	console.log(value) //=> hello
})

##API

• get(key) - returns a Promise for the value of key in cache
• add(key, value) - adds to the cache asynchronously
• update(key, value) - updates key in the cache
• delete(key) - removes key and its value from the cache
• clear() - empties cache

##Events

• add - occurs when an item is added
• update - occurs when an item is updated
• delete - happens when an item is deleted
• empty - occurs when cache is cleared

##Questions/comments

File an issue