Adds the tax module.
Adds the CommerceTaxType Entity and its Forms
Adds commerce_tax_rate and its friend

- Adds the routes
- Adds the schema
- Adds the entity
- Adds the listbuilder
- Adds the edit/delete/add forms

The listbuilder is special. It needs a controller in front of it because
it has to catch the route parameter.
Adds the CommerceTaxRateAmount and fixes stuff.

Stuff being:

- Wrong schema to entity references
- Entities have to comply with the new schema
- Minor fixes
Adds CommerceTaxTypeImporter and its friends.

It's not working yet because zones haven't been implemented yet.
Fix the travis script, use the rerolled patch from d.org.
Merge pull request #113 from jsacksick/update_travis_yml

Fix the travis script, use the rerolled patch from d.org.
Update to CommerceTaxTypeImporter
Adds the translation management
Adds CommerceTaxTypeTest for the CommerceTaxTypeEntity tests.
Merge pull request #110 from Ralt/tax

Tax