Add Wi-Fi Access Points scanning option

Adding Wi-Fi Access Points scanning in setting for enhancement on #241
Allow any tile server to be specified at build time
Merge pull request #252 from thefinn93/customTileServer

Custom tile server
Revert "Add Wi-Fi Access Points scanning option"

This reverts commit 51a10b79a3a02cd309eeb3d6e5784453b99550cf.
Block DB on-train WiFi 

See http://www.bahn.com/i/view/mdb/bahnintern/services/mobilitaet_service/zug/wlan/mdb_114824_www_im_ice_hot_spot_04_2013.pdf
Don't scan when Wi-Fi turned off
Merge pull request #254 from evilpie/patch-1

Block DB on-train WiFi
Don't scan when Wi-Fi turned off
Merge branch 'master' of https://github.com/xsoh/MozStumbler
Merge pull request #248 from xsoh/master

Add Wi-Fi Access Points scanning option