Add options and a browser-action popup.

Add an options page with a blacklist, an option to disable the extension
in embedded content, and a whitelist to override that option. Add a popup
to easily add/remove the current page from the blacklist. Add a feedback
link that pre-fills an email. Update the build script with the new files.

Options page, popup, and email text are placeholders, pending design support.

BUG=639639, 639645

Review URL: .
19 files changed
tree: c2200c66dc549e8d20ec18575506699241309d94
  1. go-back-with-backspace/
  2. .gitignore