Upgrade npm to latest 4.x release, 4.3.0.

This is a minor version bump to npm.

The release notes are available at:
  https://github.com/npm/npm/releases/tag/v4.3.0

scripts/build-dev-bundle-common.sh

@@ -7,7 +7,7 @@ UNAME=$(uname)
 ARCH=$(uname -m)
 MONGO_VERSION=3.2.12
 NODE_VERSION=4.7.3
-NPM_VERSION=4.1.2
+NPM_VERSION=4.3.0
 
 if [ "$UNAME" == "Linux" ] ; then
     if [ "$ARCH" != "i686" -a "$ARCH" != "x86_64" ] ; then

scripts/dev-bundle-tool-package.js

@@ -11,7 +11,7 @@ var packageJson = {
   dependencies: {
     // Explicit dependency because we are replacing it with a bundled version
     // and we want to make sure there are no dependencies on a higher version
-    npm: "4.1.2",
+    npm: "4.3.0",
     "node-gyp": "3.4.0",
     "node-pre-gyp": "0.6.30",
     "meteor-babel": "0.14.4",