Openfisca-country-template

* Tax and benefit system evolution.
* Impacted periods: from 2013-01-01.
* Impacted areas:
- Reform: `modify_social_security_taxation`.
* Details:
- Add a reform modifying the brackets of a scale:
- Show how to add, modify and remove a bracket.
- Add corresponding tests.

* Tax and benefit system evolution.
* Impacted periods: all.
* Impacted areas:
- `benefits`.
- `demographics`.
- `housing`.
- `income`.
- `taxes`.
* Details:
- Build the skeleton of the tax and benefit system.

Example Entry

* Tax and benefit system evolution.
* Impacted periods: all.
* Impacted areas:
- `benefits`.
- `demographics`.
- `housing`.
- `income`.
- `stats`.
- `taxes`.
* Details:
- Import model from template