Improve error reporting when XHR of an app's resource fails
Polish project template for Polymer JS element
Project templates in New Project dialog: rename, reorder, move some under a flag
Change source names in Chrome app project template to match those in other templates
Restructure Chrome extension project template to match the rest
Reformat some HTMLs to get a unified style across all templates
Add a WIP project template for JS Chrome app using Polymer JS elements
Move 'JS Chrome app using Polymer' project template under the dev flag
Additional reformatting to unify style
Address review comments + fix/expand Chrome extension template
Merge pull request #1925 from ussuri/new-project-templates

New project templates