Editing naming in model.py

[c-flaherty]

• Rename validation_score variable to cross_validation_score in model.py
• Rename cross_validation_score function to run_cross_validation
• Create a set_model_info function to be run inside run_model. Remove setting model info from get_model function
• We currently refer to all regression and classification models as "estimators". Research whether or not this is the correct term
• In class DataSet -> def clean_data, rename replace_data argument to in-place
• Remove print_model, add flag print=False flag to get_model to optionally print
• Move submit function to a utility class
• Throw a TypeError instead of general Exception in BlenderModel