Include YAML data files when packaging

Prepackaged deliverables of 7.0.0 and 7.0.1 will fail to start because `data/static/challenges.yml` and `users.yml` were missing.

Gruntfile.js

@@ -83,6 +83,7 @@ module.exports = function (grunt) {
               'app/public/**',
               'config/*.yml',
               'data/*.js',
+              'data/static/*.yml',
               'encryptionkeys/**',
               'ftp/**',
               'lib/*.js',