Implement new ios config param disableElasticity to disable speed-based...

Implement new ios config param disableElasticity to disable speed-based distance-filter auto-scaling.  Also disabled ios log-messages when debug: false

README.md

@@ -351,6 +351,10 @@ Optional HTTP params sent along in HTTP request to above ```#url```.
 
 ### iOS Config
 
+#####`@param {Boolean} disableElasticity [false]`
+
+Defaults to ```false```.  Set ```true``` to disable automatic speed-based ```#distanceFilter``` elasticity.  eg:  When device is moving at highway speeds, locations are returned at ~ 1 / km.
+
 #####`@param {String} activityType [AutomotiveNavigation, OtherNavigation, Fitness, Other]`
 
 Presumably, this affects ios GPS algorithm.  See [Apple docs](https://developer.apple.com/library/ios/documentation/CoreLocation/Reference/CLLocationManager_Class/CLLocationManager/CLLocationManager.html#//apple_ref/occ/instp/CLLocationManager/activityType) for more information

example/SampleApp/www/js/index.js

@@ -176,6 +176,7 @@ var app = {
             desiredAccuracy: 0,
             stationaryRadius: 50,
             distanceFilter: 50,
+            disableElasticity: false, // <-- [iOS] Default is 'false'.  Set true to disable speed-based distanceFilter elasticity
             locationUpdateInterval: 5000,
             activityRecognitionInterval: 10000,
             stopTimeout: 0,

www/BackgroundGeoLocation.js

@@ -18,17 +18,9 @@ module.exports = {
     config: {},
 
     configure: function(success, failure, config) {
+        config = config || {};
         this.config = config;
 
-        config.stationaryRadius     = (config.stationaryRadius >= 0) ? config.stationaryRadius : 50;    // meters
-        config.distanceFilter       = (config.distanceFilter >= 0)  ? config.distanceFilter : 500;       // meters
-        config.locationUpdateInterval = (config.locationUpdateInterval >= 0) ? config.locationUpdateInterval : 60000;      // ms
-        config.activityRecognitionInterval = (config.activityRecognitionInterval >= 0) ? config.activityRecognitionInterval : 60000;      // ms
-        config.desiredAccuracy      = (config.desiredAccuracy >= 0) ? config.desiredAccuracy : 100;     // meters
-        config.debug                = config.debug || false;
-        config.activityType         = config.activityType || "OTHER";
-        config.stopOnTerminate      = config.stopOnTerminate || false;
-
         exec(success || function() {},
              failure || function() {},
              'BackgroundGeoLocation',