#100 Fix

#100 Fix.

Now it is possible to change timeout of the implicit waiting for element is present for already instantiated proxy of WebElement. 

Raw example:

```java
public class MyScreen_PageObject{

@FindBy annotation with locator value
WebElement field;

//staff
AppiumFieldDecorator afd = new AppiumFieldDecorator(driver);
PageFactory.initElements(afd, this);
//staff

public void clickOnField(){
  afd.resetImplicitlyWaitTimeOut(2, TimeUnit.SECONDS);
  //It will wait for element is present for 2 seconds.
  field.click();
}
```

I think this feature is good for some common situations and it would be great when Spring or CGLIB are used.