Support Java 8 Optional Feature

Is it possible to support Java 8 Optional feature for the generator?

Sample model class:

``` java
public class Person {

private String name;

public Person(String name) {
this.name = name;
}

public Optional getName() {
return name == null ? Optional.empty() : Optional.of(name);
}
}
```

Generated assertion class:

``` java
public class PersonAssert extends AbstractAssert {

public PersonAssert hasName(java.util.Optional name) {
}
}
```

Suggested assert class:

``` java
public class PersonAssert extends AbstractAssert {

// Generator might lookup generic type of the Optional and generate the method without Optional parameter
public PersonAssert hasName(String name) {
}

public PersonAssert hasName(java.util.Optional name) {
}
}
```