Raffi

Results 2 issues of Raffi

- Compiles with Swift 4.2 - All unit tests fixed

When using the initializer `initWithLanguage:configDictionary:configFileNames:absoluteDataPath: engineMode:)` the property `absoluteDataPath` was not properly set, with the value passed as param, before configuring the engine. This would raise/print the error "ERROR! Can't...