Standardize qa pairs

[richagadgil]

What's New?

Eliminate redundant CSV copies, move questions to database and use API to pull latest answerable questions from db

Fixes #<> ... (e.g. #9)

Type of change (pick-one)

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration (hardware/operating system/etc). ran doctests

Checklist (check-all-before-merge)

formatting help: - [x] means "checked' and - [ ] means "unchecked"

• [ x] I documented my code according to the Google Python Style Guide

• [x ] I ran ./build_docs.sh and the docs look fine

• [ x] I ran ./type_check.sh and got no errors

• [x ] I ran ./format.sh because it automatically cleans my code for me 😄

• [x ] I ran ./lint.sh to check for what "format" missed

• [ x] I added my tests to the /tests directory

• [ x] I ran ./run_tests.sh and all the tests pass

[mfekadu]

Answers are ok

(api) ➜  api git:(standardize_qa_pairs) python3 nimbus.py
initialized database session
initialized NimbusMySQLAlchemy
initialized database session
initialized NimbusMySQLAlchemy
Enter a question: what is Foaad Khosmood
[nltk_data] Downloading package stopwords to
[nltk_data]     /Users/mfekadu/nltk_data...
[nltk_data]   Package stopwords is already up-to-date!
[nltk_data] Downloading package punkt to /Users/mfekadu/nltk_data...
[nltk_data]   Package punkt is already up-to-date!
[nltk_data] Downloading package averaged_perceptron_tagger to
[nltk_data]     /Users/mfekadu/nltk_data...
[nltk_data]   Package averaged_perceptron_tagger is already up-to-
[nltk_data]       date!
/Users/mfekadu/.local/share/virtualenvs/api-3RYm-VjB/lib/python3.6/site-packages/sklearn/base.py:251: UserWarning: Trying to unpickle estimator KNeighborsClassifier from version 0.21.3 when using version 0.20.2. This might lead to breaking code or invalid results. Use at your own risk.
  UserWarning)
{'entity': 'Foaad Khosmood', 'tag': 'PROF', 'normalized entity': 'Foaad Khosmood', 'input question': 'what is Foaad Khosmood', 'normalized question': 'what is [PROF]', 'question class': "What is [PROF]'s email?"}
Foaad Khosmood's email is foaad@calpoly.edu.