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travis-ci

added new function in type::register_wrapper_converter_for_base_classes<T>() (#132)

* added new function in type::register_wrapper_converter_for_base_classes<T>();

Register for all base classes of the giving type \p T
wrapper converter functions.
The converters are registered in both directions respectively.
From derived to base class and vice versa.

The wrapper_mapper class template, get therefore a new optional
functiont template:

template<typename U>
static std::shared_ptr<U> convert(const type& source, bool& ok)

For the wrapper classes: `std::shared_ptr<T>` and `std::reference_wrapper<T>`
default conversion functions are included.

Example:
```
struct base { virtual ~base() {}; RTTR_ENABLE() };
struct derived : base { virtual ~derived() {}; RTTR_ENABLE(base) };

variant var = std::make_shared<derived>();
var.convert(type::get<std::shared_ptr<base>>());    // yields to `false`

// register the conversion functions
type::register_wrapper_converter_for_base_classes<std::shared_ptr<derived>>();

var.convert(type::get<std::shared_ptr<base>>());    // yields to `true`, derived to base conversion
var.convert(type::get<std::shared_ptr<derived>>()); // yields to `true`, base to derived conversion
```

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