Saving some memory by using floats in CollectPredTask.

SetWrkTask writes only floats, CollectPredTask collected double which
did not make sense. Switched to floats.
Incorporated Spencer's comment about shuffling oob rows.
Removed duplicate fields from progress.
Merge branch 'master' of github.com:0xdata/h2o
Poll request_info corrected.
Response handling to produce correct poll and redirect status.
Merge branch 'master' of github.com:0xdata/h2o
Corrected redirect URL.
Merge branch 'master' of github.com:0xdata/h2o