todo.txt

- [x] move table and row functionality into separate Table class
- [x] add validation for user input
- [x] add command line interface (maybe including progress bar)
- [x] add support for other browsers (will probably require a config file)
- [x] add try-except blocks to catch stale reference exceptions and the like
- [ ] add support for other webpage types
- [ ] allow user to specify an arbitrary number of axes
    - [ ] add an optimize flag to CollateEngine.__init__ to indicate whether we should solve for the path through the specified axes that minimizes the number of total clicks/waits