Added/Tested:
* PredictionIO::AsyncIO => To get async job done.
* PredictionIO::Configurator = > to generate constants based on

Created:
* A file in lib/prediction_io called load to load all the objects
it needs to work.

Removed:
* PredictionIO::AsyncConsumer as it was not the right design.

TODO:
  Finish User implementation ( extract them and test )
  Finish Server implementation