retrained model; global variable fixes in flask_api.py

[cameron-toy]

What's New?

• Retrained model
• Fixed some bugs in flask_api.py
• Added initialize*() functions to flask_api.py; see note in source

Type of change (pick-one)

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] 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

[mfekadu]

Discussion

@Jason-Ku

1. View entity_type should not be acceptable input to insert_entity because they are generated by the MySQL DBMS

2. we might include a property _is_view to any Entity that is a View rather than a Table

3. a well-documented error when View input to insert_entity would be cool

[mfekadu]

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