Retirada da verificação de visibilidade

A chamada "waitVisibility(by);" está sendo desnecessária, isto é, o método "elementToBeClickable" da classe "ExpectedConditions" (usado em waitClickable) usa o método "visibilityOfElementLocated" da classe "ExpectedConditions" (usado em waitVisibility) :

```java
private void waitClickable(By by) {
		WebDriverWait wait = new WebDriverWait(getDriver(), (BehaveConfig.getRunner_ScreenMaxWait() / 1000));
		wait.until(ExpectedConditions.elementToBeClickable(by));
	}

	private void waitVisibility(By by) {		
		WebDriverWait wait = new WebDriverWait(getDriver(), (BehaveConfig.getRunner_ScreenMaxWait() / 1000));
		wait.until(ExpectedConditions.visibilityOfElementLocated(by));
	}

public static ExpectedCondition<WebElement> visibilityOfElementLocated(
      final By locator) {
    return new ExpectedCondition<WebElement>() {
      @Override
      public WebElement apply(WebDriver driver) {
        try {
          return elementIfVisible(findElement(locator, driver));
        } catch (StaleElementReferenceException e) {
          return null;
        }
      }

      @Override
      public String toString() {
        return "visibility of element located by " + locator;
      }
    };
  }

public static ExpectedCondition<WebElement> elementToBeClickable(
      final By locator) {
    return new ExpectedCondition<WebElement>() {

      public ExpectedCondition<WebElement> visibilityOfElementLocated =
          ExpectedConditions.visibilityOfElementLocated(locator);

      @Override
      public WebElement apply(WebDriver driver) {
        WebElement element = visibilityOfElementLocated.apply(driver);
        try {
          if (element != null && element.isEnabled()) {
            return element;
          } else {
            return null;
          }
        } catch (StaleElementReferenceException e) {
          return null;
        }
      }

      @Override
      public String toString() {
        return "element to be clickable: " + locator;
      }
    };
  }
```