Test grid-* image classification pipeline on GPUs

[tkornuta-ibm]

The use case is as follows:

run grid-trainer on the configuration file (2 models, 1 problem, 5 repetitions)
'mip-grid-trainer-gpu --c configs/vision/grid_trainer_mnist.yaml'

run grid-tested on the newly created directory with containing 10 different models
'mip-grid-tester-gpu --e --expdir ./experiments_20181109_131153'

run grid-analyzer to aggregate all the results in a single csv file
'mip-grid-analyzer --e --expdir ./experiments_20181109_131153'

[tkornuta-ibm]

closed with PR #81