Added end_timestamp and total_time to the learner_result_dict_base in experiments.py; these values now appear in the .results and .results.json file in addition to start_timestamp
Changed number of rows to be checked for in learner results dictionary from 19 to 21 in tests/test_skll.py (due to the addition of end_timestamp and total_time).
Merge branch 'develop' into feature/run-time
Changed number of rows to be checked for in learner results dictionary from 21 to 23 in tests/test_skll.py to accommodate two new fields added by Aoife.
Merge pull request #167 from EducationalTestingService/feature/run-time

Feature/run time