#163436406 modify endpoints

[bencyn]

What does this PR do?

Improve model queries, validations and routes to meet challenge four requirements

Description of tasks to be completed?

1. implement reserve meetup endpoint
2. add validations
3. modify meetup routes
4. modify questions,users and meetup models

How should this be manually tested?

1. Create a virtual environment:
   virtualenv -p python3 venv

2. Activate the virtual environment
   source venv/bin/activate

3. Clone this repository
   https://github.com/bencyn/Questioner.git

4. cd into the folder
   cd Questioner

5. Switch to current branch
   git checkout ch-modify-endpoints-163436406

6. Install requirements
   pip install -r requirements.txt

7. Export environment variables

   • export SECRET_KEY ="random string here"
   • export APP_SETTINGS="development"
   • export DATABASE_URL="dbname='questioner' host='localhost' port='5432' user='postgres' password='<password>'"
   • export TEST_DATABASE_URL="dbname='test_question' host='localhost' port='5432' user='postgres' password='<password>'"

8. run python run.py

Pivotal tracker story associated with this PR:

#163436406

Screenshots