Fix the remaining cases of inconsistent spacing and trailing commas in objects, and enable the comma-dangle and object-curly-spacing ESLint rules

http://eslint.org/docs/rules/comma-dangle
http://eslint.org/docs/rules/object-curly-spacing

*Please note:* This patch was created automatically, using the ESLint `--fix` command line option. In a couple of places this caused lines to become too long, and I've fixed those manually; please refer to the interdiff below for the only hand-edits in this patch.

```diff
diff --git a/gulpfile.js b/gulpfile.js
index d18b9c58..7d47fd8d 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -1247,7 +1247,8 @@ gulp.task('gh-pages-git', ['gh-pages-prepare', 'wintersmith'], function () {
   var reason = process.env['PDFJS_UPDATE_REASON'];

   safeSpawnSync('git', ['init'], { cwd: GH_PAGES_DIR, });
-  safeSpawnSync('git', ['remote', 'add', 'origin', REPO], { cwd: GH_PAGES_DIR, });
+  safeSpawnSync('git', ['remote', 'add', 'origin', REPO],
+                { cwd: GH_PAGES_DIR, });
   safeSpawnSync('git', ['add', '-A'], { cwd: GH_PAGES_DIR, });
   safeSpawnSync('git', [
     'commit', '-am', 'gh-pages site created via gulpfile.js script',
```

external/systemjs/plugin-babel-cached.js

@@ -26,7 +26,7 @@ function getDb() {
       var request = indexedDB.open(dbName, dbVersion);
       request.onupgradeneeded = function() {
         var db = request.result;
-        db.createObjectStore(dbCacheTable, {keyPath: 'address'});
+        db.createObjectStore(dbCacheTable, { keyPath: 'address', });
       };
       request.onsuccess = function() {
         var db = request.result;