Add missing title attributes

Summary:
Extended the linter to check for the title attribute, too, and fixed
all violations. Linter will follow in next diff.

Reviewed By: jknoxville

Differential Revision: D14366410

fbshipit-source-id: b4de3592f2537e2bb16d4c2af231e5bee45346e4

src/plugins/leak_canary/package.json

@@ -7,6 +7,7 @@
     "lodash": "^4.17.5"
   },
   "icon": "bird",
+  "title": "LeakCanary",
   "bugs": {
     "email": "jhli@fb.com"
   }