Monopyly

- Bump dependencies (including patching security vulnerability in gunicorn)
- Add a function for acquiring a statement and all of its transactions
- Add a convenience method to the statement handler for getting the preceding statement

- Fix bug where a transaction for a new statement was marked as invalid on entry
- Sort bank account displays by account type and last four digits
- Use SQLAlchemy 'selectin' loading mode for commonly loaded relationships
- Give tags a property for identifying their depth in the user's "tag tree"

- Update date-to-timestamp conversion to be timezone invariant
- Fix database initialization for development mode
- Fix bug where credit card number was not displayed in card summary
- Use Beautiful Soup to make tests more robust

- Reconfigure makefile for smoother installation
- Fix bug where transaction toggling failed on filter updates

- Configure production mode via Gunicorn
- Standardize CLI usage messages
- Make browser usage optional in CLI run script

- Use local time for determining projected balances
- Show future credit statement payments as "scheduled" (and improve logic for displaying paid notices)
- Fix incorrect return type in `CreditStatementHandler.infer_statement` method
- Distinguish between inline code and "fenced" code using a Markdown library extension
- Use more `data-*` attributes for processing transaction IDs
- Fix bug where linked transactions did not use jQuery reference