Merge pull request #672 from OpenGeoscience/pin-proj4-version

Pin proj4 to version 2.3.16

Author: jbeezley

package.json

@@ -65,7 +65,7 @@
     "nib": "^1.1.2",
     "node-resemble": "^1.1.3",
     "phantomjs-prebuilt": "^2.1.5",
-    "proj4": "^2.3.14",
+    "proj4": "2.3.16",
     "raw-body": "^2.1.6",
     "sinon": "1.17.3",
     "style-loader": "^0.13.1",