Version 0.22.0

This release features mostly bug fixes, but also includes a few minor features:

- Change license to BSD 3 clause. Now any of our code could be added back into scikit-learn without licensing issues.
- Add gamma to default paramater search grid for SVC (#84).
- Add `--verbose` flag to `run_experiment` to simplify debugging.
- Add support for wheel packaging.
- Fixed bug in `_write_summary_file` that prevented writing of summary files for `--ablation_all` experiments.
- Fixed SVR kernel string type issue (#87).
- Fixed `fit_intercept` default value issue (#88). 
- Fixed incorrect error message (#86)
- Tweaked `.travis.yml` to make builds a little faster.