Taxcalc

- Test TaxBrain handling of delayed reforms
- Move cmbtp calculation and earnings splitting logic from Records class to puf.csv file preparation
- Revise Behavior class logic
- Add unit tests to increase code coverage to 98 percent.
- Create Consumption class used to compute "effective" marginal tax rates
- Update Numpy and Pandas dependencies to latest versions to avoid a bug in the Windows conda package for Pandas 0.16.2, see this issue.
- Add scripts to version and release.

- Add --records option to simtax.py
- Add --csvdump option to inctax.py
- Add three d samples to Tax-Calculator versus Internet-TAXSIM comparisons
- Add first set of Tax-Calculator versus TaxBrain comparisons
- Document first set of Tax-Calculator versus taxcalc.sas comparisons
- Add data and logic to implement EITC age-eligibility rules
- Fix Child Care Expense logic
- Exclude dependents from EITC eligibility
- Update and fix 10_minutes_to_Tax-Calculator.ipynb
- Update files in taxcalc/comparison