switch to https URLs for tiles

for #9

p3k/geo/StaticMap.php

@@ -198,33 +198,33 @@ function generate($params, $filename, $assetPath) {
 
   $tileServices = array(
     'streets' => array(
-      'http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer/tile/{Z}/{Y}/{X}'
+      'https://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer/tile/{Z}/{Y}/{X}'
     ),
     'satellite' => array(
-      'http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{Z}/{Y}/{X}'
+      'https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{Z}/{Y}/{X}'
     ),
     'hybrid' => array(
-      'http://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{Z}/{Y}/{X}',
-      'http://server.arcgisonline.com/ArcGIS/rest/services/Reference/World_Boundaries_and_Places/MapServer/tile/{Z}/{Y}/{X}'
+      'https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{Z}/{Y}/{X}',
+      'https://server.arcgisonline.com/ArcGIS/rest/services/Reference/World_Boundaries_and_Places/MapServer/tile/{Z}/{Y}/{X}'
     ),
     'topo' => array(
       'http://server.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer/tile/{Z}/{Y}/{X}'
     ),
     'gray' => array(
-      'http://server.arcgisonline.com/ArcGIS/rest/services/Canvas/World_Light_Gray_Base/MapServer/tile/{Z}/{Y}/{X}',
-      'http://server.arcgisonline.com/ArcGIS/rest/services/Canvas/World_Light_Gray_Reference/MapServer/tile/{Z}/{Y}/{X}'
+      'https://server.arcgisonline.com/ArcGIS/rest/services/Canvas/World_Light_Gray_Base/MapServer/tile/{Z}/{Y}/{X}',
+      'https://server.arcgisonline.com/ArcGIS/rest/services/Canvas/World_Light_Gray_Reference/MapServer/tile/{Z}/{Y}/{X}'
     ),
     'gray-background' => array(
-      'http://server.arcgisonline.com/ArcGIS/rest/services/Canvas/World_Light_Gray_Base/MapServer/tile/{Z}/{Y}/{X}',
+      'https://server.arcgisonline.com/ArcGIS/rest/services/Canvas/World_Light_Gray_Base/MapServer/tile/{Z}/{Y}/{X}',
     ),
     'oceans' => array(
-      'http://server.arcgisonline.com/ArcGIS/rest/services/Ocean_Basemap/MapServer/tile/{Z}/{Y}/{X}'
+      'https://server.arcgisonline.com/ArcGIS/rest/services/Ocean_Basemap/MapServer/tile/{Z}/{Y}/{X}'
     ),
     'national-geographic' => array(
-      'http://server.arcgisonline.com/ArcGIS/rest/services/NatGeo_World_Map/MapServer/tile/{Z}/{Y}/{X}'
+      'https://server.arcgisonline.com/ArcGIS/rest/services/NatGeo_World_Map/MapServer/tile/{Z}/{Y}/{X}'
     ),
     'osm' => array(
-      'http://tile.openstreetmap.org/{Z}/{X}/{Y}.png'
+      'https://tile.openstreetmap.org/{Z}/{X}/{Y}.png'
     ),
     'stamen-toner' => array(
       'http://tile.stamen.com/toner/{Z}/{X}/{Y}.png'