feature_evaluation grid search

[Gottfrid91]

Description

The cropping function in manipulate.py and get_image_feature.py file now take **kwargs for easy passing of multiple cropping parameters to perform grid search. Remaining is the evaluation script in hs_feature_evaluation.ipynb.

1. Add function to compute cluster quality score for grid search comparisons
2. finish the evaluation loop in hs_feature_evaluation.ipynb computing features, clusters and cluster quality score for each crop setting. See notebook for more detail.

NOTE: most likely one need multithreading for feasability of all features