add vegas script
delete IntroToDataScience stuff from QSTK directory
add notes for homework_3
delete directory
add script for bollinger plot (week 7)
initialize DataFrame using ravel function
Merge branch 'master' of https://github.com/luillo76/eLearning

Conflicts:
	IntroToDataScience/lesson_2/Master.csv
	IntroToDataScience/lesson_2/aadhaar_data.csv
	IntroToDataScience/lesson_2/api_quiz_solution.py
	IntroToDataScience/lesson_2/basic_sql.py
	IntroToDataScience/lesson_2/complex_sql.py
	IntroToDataScience/lesson_2/csv_file.py
	IntroToDataScience/lesson_2/imputation.py
	IntroToDataScience/lesson_2/lastfm.json
	IntroToDataScience/lesson_3/coefficient_of_determination/coefficient_of_determination.py
	IntroToDataScience/lesson_3/gradient_descent/gradient_descent.py
	IntroToDataScience/lesson_3/t-test/t_test.py
	IntroToDataScience/project_1/complex_heuristics.py
	IntroToDataScience/project_1/custom_heuristics.py
	IntroToDataScience/project_1/simple_heuristics.py
	IntroToDataScience/project_1/titanic_data.csv
	IntroToDataScience/project_2/10_time_to_hour/time_to_hour.py
	IntroToDataScience/project_2/10_time_to_hour/turnstile_data_master_subset_consolidate_rows.csv
	IntroToDataScience/project_2/11_reform_subway_dates/reform_subway_dates.py
	IntroToDataScience/project_2/11_reform_subway_dates/turnstile_data_master_subset_time_to_hours.csv
	IntroToDataScience/project_2/1_num_rainy_days/num_rainy_days.py
	IntroToDataScience/project_2/1_num_rainy_days/weather_underground.csv
	IntroToDataScience/project_2/2_foggy_and_non_foggy_days/weather_underground.csv
	IntroToDataScience/project_2/3_mean_temp_on_weekends/mean_weekend_temp.py
	IntroToDataScience/project_2/3_mean_temp_on_weekends/weather_underground.csv
	IntroToDataScience/project_2/4_mean_temp_on_rainy_days/mean_temp_on_rainy_days.py
	IntroToDataScience/project_2/4_mean_temp_on_rainy_days/weather_underground.csv
	IntroToDataScience/project_2/5_fix_turnstile_data/fix_turnstile_data.py
	IntroToDataScience/project_2/5_fix_turnstile_data/turnstile_110528.txt
	IntroToDataScience/project_2/5_fix_turnstile_data/turnstile_110604.txt
	IntroToDataScience/project_2/6_combining_turnstile_data/create_master_turnstile.py
	IntroToDataScience/project_2/6_combining_turnstile_data/turnstile_110528.txt
	IntroToDataScience/project_2/6_combining_turnstile_data/turnstile_110604.txt
	IntroToDataScience/project_2/7_filter_by_regular/filter_by_regular.py
	IntroToDataScience/project_2/7_filter_by_regular/turnstile_data_master.csv
	IntroToDataScience/project_2/8_get_hourly_entries/get_hourly_entries.py
	IntroToDataScience/project_2/8_get_hourly_entries/turnstile_data_master_subset_regular.csv
	IntroToDataScience/project_2/9_get_hourly_exists/get_hourly_exists.py
	IntroToDataScience/project_2/9_get_hourly_exists/turnstile_data_master_subset_get_hours_entries.csv
	IntroToDataScience/project_3/1_plot_histogram/plot_histogram.py
	IntroToDataScience/project_3/3_mann_whitney_u_test/mann_whitney_u.py
	IntroToDataScience/project_3/5_linear_regression/predictions.py
	IntroToDataScience/project_3/6_plot_residuals/prediction.py~
	IntroToDataScience/project_3/7_compute_r_squared/coefficient_of_determination.py
	IntroToDataScience/project_3/7_compute_r_squared/prediction.py
	IntroToDataScience/project_3/8_other_linear_regressions/advanced_linear_regressions.py~
	IntroToDataScience/project_3/turnstile_data_master_with_weather.csv