156 write functions to extract survey results data from the database

[jimenasalinas]

Wrote 6 functions that calculate the following metrics to display survey results:

1. number of responses
2. percentage of people who responded and are frequent users
3. avg rider satisfaction from answers
4. count of responses by transit mode
5. count of responses by time of day
6. suggested improvements from users who own a car
7. suggested improvements from users who don't own a car

Output example for checking against db records:

Number of responses NY: 22
Avg rider satisfaction NY: 3.8
% transit use NY: 50.0
Count responses by transit mode NY: {'Bus': 4, 'Train': 4, 'Car': 2, 'Bike': 1, 'Walking': 6, 'Rideshare': 1}
Count responses by time of day NY: {'Peak commute hours': 8, 'Daytime': 9, 'Nighttime': 1}
Count improvement suggestions from people with a car NY: {'More frequent service': 1, 'More accurate schedule times': 0, 'Fewer transfers or a more direct route': 0, 'It feels safe at the station and onboard': 0, 'No improvement needed': 0}
Count improvement suggestions from people without a car NY: {'More frequent service': 0, 'More accurate schedule times': 2, 'Fewer transfers or a more direct route': 2, 'It feels safe at the station and onboard': 0, 'No improvement needed': 1}

Number of responses Chicago: 10
Avg rider satisfaction Chicago: 3.0
% transit use Chicago: 40.0
Count responses by transit mode Chicago: {'Bus': 3, 'Train': 0, 'Car': 3, 'Bike': 1, 'Walking': 2, 'Rideshare': 0}
Count responses by time of day Chicago: {'Peak commute hours': 4, 'Daytime': 2, 'Nighttime': 3}
Count improvement suggestions from people with a car Chicago: {'More frequent service': 0, 'More accurate schedule times': 0, 'Fewer transfers or a more direct route': 0, 'It feels safe at the station and onboard': 0, 'No improvement needed': 0}
Count improvement suggestions from people without a car Chicago: {'More frequent service': 0, 'More accurate schedule times': 2, 'Fewer transfers or a more direct route': 1, 'It feels safe at the station and onboard': 0, 'No improvement needed': 0}