Add action readAll (default is off)

Hi, 
my every function actionRead() begins with:

```php
function actionRead($id) {
    if ($id) {
        // read one row
    } else {
        // read list of rows
    }
}
```
this commit add actionReadAll()

```php
function actionReadAll() {
    // read list of rows
}

function actionRead($id) {
    // read one row
}
```

for backward compatibility I added third params useReadAll with default  false. What do you think about it?