added a unit test to make sure skll does not crash in cross-validation when there are rare classes that might only show up in a test fold
Add missing ** to CONTRIBUTING.md
Clarify difference between "easy" and "help wanted"
merged the latest develop branch, cleaned up unused imports
made skll install a specific scikit-learn version, 0.15.2
fixed path problems in cross_val.cfg and evaluate.cfg
Merge remote-tracking branch 'origin/develop' into feature/iris
raised an error when the featureset_name goes more than 210 characters.
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
added uses StratifiedKFold in cross validation message in the documentation
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).
fixes for CV with rare classes: separated out creation of label dictionaries, added warnings, etc.
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.
dataset that can test regression models (closes #162)
reverted back temporarily to old test
Merge pull request #167 from EducationalTestingService/feature/run-time

Feature/run time
updated 19 to 20 after getting unit test failures
added scikit-learner version to output json and final output files
Starting work on #153.