Add in-publish to execute prepublish correctly

Author: Safia Abdalla

package.json

@@ -9,9 +9,10 @@
     "url": "http://github.com/nteract/zmq-prebuilt.git"
   },
   "dependencies": {
+    "bindings": "~1.2.1",
+    "in-publish": "^2.0.0",
     "nan": "~2.4.0",
-    "prebuild": "^2.9.0",
-    "bindings": "~1.2.1"
+    "prebuild": "^2.9.0"
   },
   "devDependencies": {
     "mocha": "~1.13.0",
@@ -22,6 +23,7 @@
     "node": ">=0.8"
   },
   "scripts": {
+    "prepublish": "in-publish && node build.js || echo 'Not in npm prepublish.'",
     "install": "prebuild --install",
     "test": "mocha --expose-gc --slow 2000 --timeout 600000"
   },