Allow "npm run build:pack" to work even in a cleanly-cloned directory; previously the lack of a plain 'npm install' command caused it to fail with errors like "Cannot find module 'lodash'". (#75)

Author: Robert-Jan Huijsman

package.json

@@ -5,7 +5,7 @@
   "main": "lib/index.js",
   "scripts": {
     "build": "node_modules/.bin/tsc -p tsconfig.release.json",
-    "build:pack": "npm prune --production && rm -rf lib && npm install typescript firebase-admin && node_modules/.bin/tsc -p tsconfig.release.json && npm pack && npm install",
+    "build:pack": "npm prune --production && rm -rf lib && npm install && npm install firebase-admin && node_modules/.bin/tsc -p tsconfig.release.json && npm pack && npm install",
     "build:release": "npm install --production && npm install typescript firebase-admin && node_modules/.bin/tsc -p tsconfig.release.json",
     "lint": "node_modules/.bin/tslint src/{**/*,*}.ts spec/{**/*,*}.ts integration_test/functions/src/{**/*,*}.ts",
     "pretest": "node_modules/.bin/tsc && cp -r spec/fixtures .tmp/spec",