5 features added: version, expand all, collapse all, copy JSON and autoload

#2 
- Versions now displayed for all submodules
- expand all JSON button
- collapse all JSON button
- Extension is automatically loaded on qualified urls

"Copy JSON" to clipboard feature:
- Needed to refactor JS so that the chrome extension API is available
- added jQuery
- added backgorund.js for doing the actual copy-to-clipboard