Meiga

* Add new feature on `unwrap_or_return` Result method. Now, is possible to return a specific value on failure.
- `result.unwrap_or_return(return_value_on_failure=isSuccess)`

* Add `BoolResult` alias

* Update meiga decorator to catch raised `meiga.Error`

* Add missing files in `MANIFEST`

* Solved https://github.com/alice-biometrics/meiga/issues/8

* Now is not necessary to add ([1],) a tuple when you want to pass a list as parameter (Result handler), just pass your list [1]