week5 notebook updates
Merge branch 'master' of https://github.com/mike-tamir/GA_DAT7

Conflicts:
DAT7 iPython
notebooks/.ipynb_checkpoints/DAT7-lab4.1_Logistic_regression_and_ROCs_so
l-checkpoint.ipynb
DAT7 iPython notebooks/DAT7-lab5.1_K-means.ipynb
DAT7 iPython notebooks/DAT7-lab5.1_K-means_sol.ipynb
DAT7 iPython notebooks/DAT7-lab5.2_Decision_Trees_and_RF.ipynb
DAT7 iPython notebooks/DAT7-lab5.2_Decision_Trees_and_RF_sol.ipynb
conflict resolution