Add OSM nominatim req to ServerController

Have I said that I like beginning new features on the master
branch and then seeing how much stuff actually gets done?
Yay...

See #40, #92

ParkenDD/Constants.swift

@@ -11,6 +11,7 @@
 */
 struct Const {
 	static let apibaseURL = "https://park-api.higgsboson.tk/"
+	static let nominatimURL = "https://nominatim.openstreetmap.org/search"
 	static let supportedAPIVersion = 1.0
 	static let rssURL = "http://parkendd.tumblr.com/rss"
 }

ParkenDD/ServerController.swift

@@ -135,4 +135,19 @@ class ServerController {
 			}
 		}
 	}
+
+	static func sendNominatimRequest(searchString: String, completion: (lat: Double, lng: Double) -> ()) {
+		let parameters: [String:AnyObject] = [
+			"q": searchString,
+			"format": "json",
+			"accept-language": "de",
+			"limit": 1,
+			"addressdetails": 1
+		]
+
+		Alamofire.request(.GET, Const.nominatimURL, parameters: parameters).validate().responseJSON { (_, res, jsonData, err) -> Void in
+			let json = JSON(jsonData!)
+			completion(lat: json[0]["lat"].doubleValue, lng: json[0]["lon"].doubleValue)
+		}
+	}
 }