add livereload plugin

README.md

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+##Silky 插件说明
+
+1. 每增加有一个插件，请更新本文件进行插件使用（包括配置）说明．
+
+### livereload
+
+Author: ec.huyinghuan@gmail.com
+
+Desc: 页面自动更新
+
+安装
+```
+silky install livereload
+```
+
+使用，在.silky/config.js中修改如下部分
+
+```
+  ......
+  //插件的配置
+  plugins: {
+      ......
+      "livereload": {
+          "exts": ['less', 'coffee', 'hbs', 'html', 'css', 'js', 'htm', 'handlebars', 'scss'] #需要监控变化的文件后缀
+      }
+      ......
+  },
+  ......
+```

livereload/index.coffee

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+_mime = require 'mime'
+_livereload = require 'livereload'
+
+exports.silkyPlugin = true
+
+_defaultConfig =
+  "exts": ['less', 'coffee', 'hbs', 'html', 'css', 'js', 'htm', 'handlebars', 'scss']
+  port: "14423"
+
+
+extend = (source, dest)->
+  for key, value of dest
+    source[key] = value
+  source
+
+exports.registerPlugin = (silky, options)->
+  return if not options
+  config = extend _defaultConfig, options
+  silky.registerHook('route:initial', ->
+    llServer = _livereload.createServer(config)
+    llServer.watch process.cwd()
+  )
+
+  silky.registerHook('route:willResponse', (data)->
+    return if _mime.extension(data.mime) isnt 'html'
+    script = "    <script src='http://localhost:#{_defaultConfig.port}/livereload.js'></script>\n$1"
+    data.content = data.content.replace /(<\/\s*head>)/i, script
+  )

livereload/package.json

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+{
+  "name": "silky-livereload",
+  "version": "0.0.1",
+  "dependencies": {
+    "livereload": "^0.4.0",
+    "mime": "^1.3.4"
+  }
+}