HunterMcGushion / hyperparameter_hunter / 515

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master: 95%

Pull #120

travis-ci

Add unit tests on `FeatureEngineer` within `CVExperiment`

- These tests assert equality with the updated dataset attributes
of `CVExperiment` after executing a partially prepared `CVExperiment`
- Includes test with `EngineerStep` that requests a merged dataset
- Note: `assert_frame_equal` calls in :func:`test_feature_engineer_experiment`
use `check_dtype=False` because ints were occasionally converted to floats in the
engineer step functions
- Note: :func:`get_pima_data`, which is also used by preexisting tests, has been
updated to return `train_targets` and `holdout_targets` as DataFrames, rather than Series

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