Added all packages to setup.py.
New version on setup.py.
Moved methods to find columns of a certain type to the data model.
Added a BaseTransformer class so all the transformers have the same API.
Added a NormalizeTransformer, that only normalizes the needed columns.
Added support for a target feature (only at the end of the csv file).
Normalization is now done by substracting the mean and dividing by the standard deviation.
Changed abris methods naming so they're not the same as scikit-learn (as they're not exactly compatible right now).