MozStumbler v0.15.0

* Modify the date format to YYYY-mm-01 (@tamcap)
* Show number of GPS satellites used / visible on main screen (@tamcap)
* Compress location lookup using gzip (@tamcap)
* Redesign menu UI (@tamcap)
* Add Bokmål (Norwegian) translation (@sigurdga)
* Block Adelaide Metro Public WiFi (@tamcap)
* Block MÁV (Hungarian State Railways) InterCity train hot-spots (@flaki)
* Update bn-BD translation (@aniruddha-adhikary)
* Update Dutch translation (@martiensch)
* Update French translation (@pl6025)
* Update Hebrew Translation (@arthurzam)
* Update Italian translation (@musuruan)
* Update Polish translation (@tamcap)
* Update zh-TW translation (@petercpg)