biopredyn.result module refactoring:

- biopredyn.datagenerator.DataGenerator.get_values returns an array of time series instead of an array of experiments
- output methods in biopredyn.signals.Data derived classes updated accordingly.
biopredyn.result module refactoring:

- added import_from_csv_file and import_from_numl_file methods to biopredyn.result.Result class
- added tests for these methods