title: .waitForElementVisible is unresolved function in Nightwatch template project
body: <p>I have followed steps from <a href="http://nightwatchjs.org/gettingstarted" rel="nofollow noreferrer">http://nightwatchjs.org/gettingstarted</a>. 
  And in my test file I have next code from <a href="http://nightwatchjs.org/guide/" rel="nofollow noreferrer">http://nightwatchjs.org/guide/</a></p>
  
  <pre><code>module.exports = {
      'Demo test Google' : function (browser) {
      browser
          .url('http://www.google.com')
          .waitForElementVisible('body', 1000)
          .setValue('input[type=text]', 'nightwatch')
          .waitForElementVisible('button[name=btnG]', 1000)
          .click('button[name=btnG]')
          .pause(1000)
          .assert.containsText('#main', 'Night Watch')
          .end();
          }
  };
  </code></pre>
  
  <p>Also, this is how my package.json looks like.</p>
  
  <pre><code>{
    "name": "try_nw",
    "version": "1.0.0",
    "description": "try_nightwatch",
    "main": "nightwatch.js",
    "scripts": {
    "test": "node nightwatch -e chrome"
  },
    "author": "",
    "license": "ISC",
  "dependencies": {
    "bower": "^1.8.2",
    "chromedriver": "^2.34.0",
    "geckodriver": "^1.10.0",
    "nightwatch": "^0.9.19",
    "selenium-server-standalone-jar": "^3.8.1"
    }
  }
  </code></pre>
  
  <p>And My nightwatch.json </p>
  
  <pre><code>{
    "src_folders" : ["tests"],
    "output_folder" : "reports",
    "custom_commands_path" : "",
    "custom_assertions_path" : "",
    "page_objects_path" : "",
    "globals_path" : "",
  
      "selenium" : {
    "start_process" : true,
  "start_session" : true,
  "server_path" : "bin/selenium-server-standalone-3.8.1.jar",
  "log_path" : "",
  "port" : 4444,
  "cli_args" : {
    "webdriver.chrome.driver" : "bin/chromedriver.exe",
    "webdriver.gecko.driver" : "",
    "webdriver.edge.driver" : ""
   }
  },
  
  "test_settings" : {
  "default" : {
    "launch_url" : "http://localhost",
    "selenium_port"  : 4444,
    "selenium_host"  : "localhost",
    "silent": true,
    "screenshots" : {
      "enabled" : false,
      "path" : ""
    },
    "desiredCapabilities": {
      "browserName": "chrome",
      "javascriptEnabled": true,
      "acceptSslCerts": true,
      "chromeOptions" : {
        "args" : ["--no-sandbox", "--start-maximized", "--disable-infobars"]
    }
    }
  },
  
  "chrome" : {
    "desiredCapabilities": {
      "browserName": "chrome",
      "javascriptEnabled": true,
      "acceptSslCerts": true
    }
  },
  
  "edge" : {
    "desiredCapabilities": {
      "browserName": "MicrosoftEdge"
     }
    }
   }
  }
  </code></pre>
  
  <p><strong>But, when I run the test, the blank tab of chrome opens and console shows next output.</strong></p>
  
  <pre><code>Starting selenium server... started - PID:  15024
  
  [Googletests] Test Suite
  ============================
  
  Running:  Demo test Google
  
  × Timed out while waiting for element &lt;body&gt; to be present for 1000 
    milliseconds.  - expected "visible" but got: "not found"
  
  at Object.Demo test Google (E:\JS\Try_NW\tests\googletests.js:6:14)
  at process._tickCallback (internal/process/next_tick.js:150:11)
  
  
  FAILED:  1 assertions failed (5.972s)
  
   _________________________________________________
  
   TEST FAILURE:  1 assertions failed, 0 passed. (6.088s)
  
   × googletests
  
  - Demo test Google (5.972s)
  Timed out while waiting for element &lt;body&gt; to be present for 1000 milliseconds.  - expected "visible" but got: "not found"
     at Object.Demo test Google (E:\JS\Try_NW\tests\googletests.js:6:14)
     at process._tickCallback (internal/process/next_tick.js:150:11)
  
  
   Process finished with exit code 1
  </code></pre>
  
  <p><strong>So,</strong> &lt;.waitForElementVisible> <strong>is not defined. Can anybody suggest a decision?</strong></p>