[WIP - do not merge!] Move sparkdl utilities for conversion between numpy arrays and image schema to ImageSchema#90

tomasatdatabricks wants to merge 3 commits intodatabricks:masterdatabricks/spark-deep-learning:masterfrom

tomasatdatabricks:tomas/ImageSchemaUpdate2tomasatdatabricks/spark-deep-learning:tomas/ImageSchemaUpdate2Copy head branch name to clipboard