Updated Dependencies

[EricSoroos]

This PR contains a forklift upgrade of all the JS dependencies for geoview, including some updates to the ol-helpers.

  "dependencies": {
-    "ol-helpers": "pduchesne/ol-helpers#ol4",
-    "leaflet": "~0.7.7",
-    "proj4leaflet": "~0.7.2",
-    "proj4": "^2.3.17"
+    "ol-helpers": "derilinx/ol-helpers#ol9",
+    "leaflet": "1.9.4",
+    "proj4leaflet": "1.0.2",
+    "proj4": "^2.11.0"
  },

There's still some work that can be done to pare down some of the code in ol-helpers -- there's a bunch that's not called.

This also adds:

• Working proxy with AGOL online open data endpoints, due to their cors setup it's a bit tricky.
• Style expressions and stying working in the OpenLayers viewer, from the view config.
• Removed bootstrap 2, using ckan's core vendered version.

Note -- the first commit is gigantic, because bower is pulling in a ton of vendored source, and not the just dist files. Bower itself is deprecated, so we might want to figure out how to do this using some other method.

[amercader]

Closed in favour of #102