New transformation

* Merge data from Sigel and DBS based on isil
* Enrich Sigel data with geo coordinates by using map of addresses with geo coordinates (one map for lat, one map for lon coordinates)
* Handle different addresses in Sigel data (different types: "Sitzadresse", "Postadresse", "Weitere Adresse")
* Change structure of location and address data: location contains visitor address ("Sitzadresse"), other address ("Weitere Adresse"), opening hours, and geo data
* Update Elasticsearch mapping of geo data and adjust tests to work with new geo data structure
* Update transformation of telephone number and email address: Only take phone and email from visitor address ("Sitzadresse")
* Fix URLs of "url" and "provides" to begin with "http://" or "https://"
* Handle fields "gemeindekennzahl" of DBS and "032P.n" of Sigel: Use map (ags-rs-map.csv) to transform 8-digit value of "032P.n" into 12-digit "Regionalschlüssel" format (same format as "gemeindekennzahl" of DBS); derive 8-digit value from "gemeindekennzahl" of DBS (same format as "032P.n" of Sigel)
* Add look-up of geonames in map using 8-digit "Gemeindeschlüssel" ("032P.n" of Sigel and a 8-digit derivation of "gemeindekennzahl" in DBS) for field "containedIn"
* Change transformation of "@type" using field "035E.f" of Sigel to look up correct URI in libtype-map.csv
* Adjust Context according to transformation
* Update tests and Play web app to work with new data
* Update README.textile