mode RunTab to a class

src/app/tabs/run-tab.js

@@ -1,7 +1,7 @@
 var $ = require('jquery')
 var yo = require('yo-yo')
 var EventManager = require('../../lib/events')
-var globlalRegistry = require('../../global/registry')
+var globalRegistry = require('../../global/registry')
 var executionContext = require('../../execution-context')
 var Card = require('../ui/card')
 var css = require('./styles/run-tab-styles')
@@ -15,7 +15,9 @@ var ContractDropdownUI = require('./runTab/contractDropdown.js')
 var Recorder = require('./runTab/model/recorder.js')
 var RecorderUI = require('./runTab/recorder.js')
 
-function runTab (opts, localRegistry) {
+class RunTab {
+
+  constructor (opts, localRegistry) {
     var self = this
     self.event = new EventManager()
     self._view = {}
@@ -25,7 +27,7 @@ function runTab (opts, localRegistry) {
       another environment. e.g Transactions created in Javascript VM can be replayed in the Injected Web3.`
     }
     self._components = {}
-  self._components.registry = localRegistry || globlalRegistry
+    self._components.registry = localRegistry || globalRegistry
     self._components.transactionContextAPI = {
       getAddress: (cb) => {
         cb(null, $('#txorigin').val())
@@ -184,8 +186,12 @@ function runTab (opts, localRegistry) {
     </div>
     `
     container.appendChild(el)
+    this.container = container
+  }
 
-  return { render () { return container } }
+  render () {
+    return this.container
+  }
 }
 
-module.exports = runTab
+module.exports = RunTab