Urbansim-templates

- fixes a bug with the `out_transform` parameter for `OLSRegressionStep`

- introduces classes for storing common settings: `shared.CoreTemplateSettings`, `shared.OutputColumnSettings`
- adds new shared functions: `shared.register_column()`, `utils.cols_in_expression()`
- modifies `ColumnFromExpression` template to divide its parameters into three groups

- adds new template: `data.ColumnFromExpression`

- adds new data management utilities: `utils.validate_table()`, `utils.validate_all_tables()`, `utils.merge_tables()`
- updates `utils.get_data()` to use the new merge tool
- updates `BinaryLogitStep` and `OLSRegressionStep` to use the shared to use `utils.get_data()`, removing any reliance on Orca broadcasts
- raises the `pandas` requirement to 0.23

- adds an `mct` argment to `SegmentedLargeMultinomialLogitStep.fit_all()`
- adds an `interaction_terms` argument to `SegmentedLargeMultinomialLogitStep.run_all()`