Move npmignore blacklist to package.json whitelist

Author: andrewimm

.npmignore

@@ -7,6 +7,14 @@
     "type": "git",
     "url": "https://github.com/ParsePlatform/parse-server"
   },
+  "files": [
+    "bin/",
+    "lib/",
+    "src/",
+    "LICENSE",
+    "PATENTS",
+    "README.md"
+  ],
   "license": "BSD-3-Clause",
   "dependencies": {
     "apn": "^1.7.5",