Add Austrian locale file: de-at.yml

* Add about 200 real street names that were randomly chosen
* Add about 150 real city names that were also randomly chosen
* Add 9 states and their abbreviations
* Add telephone numbers
* copied the rest from the 'de' locale

Source: http://www.statistik.at
Add Italian locale file

based on https://github.com/fzaninotto/Faker/tree/master/src/Faker/Provider/it_IT
Merge pull request #129 from sgabler/master

Add Austrian and Italian locale file: de-at.yml & it.yml