Updated to be able to use 'seeOptionIsSelected' and 'dontSeeOptionIsSelected' by label

Hi, 

I want to use `seeOptionIsSelected` by label...


Test:
```
$I->fillField('Name', 'Mike');             // by label -> OK
$I->fillField('Address', 'Tokyo');         // by label -> OK
$I->selectOption('Age', '60-100');         // by label -> OK
$I->seeOptionIsSelected('Age', '60-100');  // by label -> ERROR 
```

Error Detail:
```
Sorry, I couldn't see option is selected "Age","60-100":
Element located either by name, CSS or XPath 'select 'Age'' was not found on page.
```