only include dependencies with bower files of their own

Author: jgravois

bower.json

@@ -4,10 +4,7 @@
   "license": "Apache-2.0",
   "main": "dist/esri-leaflet.js",
   "dependencies": {
-    "arcgis-to-geojson-utils": "^1.0.1",
-    "leaflet": "^1.0.0",
-    "leaflet-virtual-grid": "^1.0.3",
-    "tiny-binary-search": "^1.0.2"
+    "leaflet": "^1.0.0"
   },
   "ignore": [
     "**/.*",