Cosmetics re. quiet_mode and logging.
Remove unneeded local variable.
Modify local trash to also delete the Frame itself if it's in the K-V store, not just the Vecs.
Clean up memory cleanup for DL Model.
Remove unneeded cast.
Remove comments, add a comment.
Only depend on _adaptedFrame's domain(), not on the vecs().
Enable multi-threading for Spirals and Prostate DL Junit tests.
Cache feature names (so that it doesn't require data_info._adaptedFrame).
Merge branch 'master' of https://github.com/0xdata/h2o