Allow to switchoff github release

Revert "Enable NCCL for multi-gpu support"

This reverts commit 57d110a.

Optionaly fail when gpu_id is set to invalid value (dmlc#6342)

Merge pull request #89 from h2oai/michalk_nccl-1

Enable NCCL for multi-gpu support

[SW-2437] relocate to ai.h2o package (#88)

[SW-2437] relocate to ai.h2o package (#88)

[jenkins] another fix for github credentials

also remove scripts moved to h2o-3 repo

Merge tag 'v1.0.1' into h2o3

fix gblinear.dump again

Merge pull request #79 from h2oai/michalk_process-keepalive

Added a patch that prevents Rabit from shutting down the process