added driver program to train/test FMQA models

[UnixJunkie]

also added some test data that I know is modelizable by several
regressors

[UnixJunkie]

related to #4

[UnixJunkie]

Example use:

# ./bin/fmqa_model.py -i data/test_data.csv --NxCV 5
13:27:39 (lines, cols): 741 120
13:27:40 (R2, RMSE)_train: 0.967 0.020
13:27:40 NxCV: 5
13:27:41 fold 0 (R2, RMSE)_test: 0.564 0.064
13:27:42 fold 1 (R2, RMSE)_test: 0.697 0.063
13:27:44 fold 2 (R2, RMSE)_test: 0.753 0.055
13:27:45 fold 3 (R2, RMSE)_test: 0.735 0.060
13:27:46 fold 4 (R2, RMSE)_test: 0.681 0.062
13:27:46 len(truth) == len(estimate): 741
13:27:46 global (R2, RMSE)_test: 0.695 0.061

If you have gnuplot installed, it creates a regression plot then.

[UnixJunkie]

If this PR is accepted, I'll add the code to save/load a model for production use.