Improve option page rendering

Hi,

I've made some updates on the option page, to:
 - Fit a better way to bootstrap default template
 - Add an option All / None on every project line
 - Avoid caching issues

Here is a preview:
![demo](https://cloud.githubusercontent.com/assets/752030/3481557/c441200a-0373-11e4-8e51-8a55ed85002d.jpg)

-- Bruno
You're right!
Fixed with https://github.com/brunosabot/chrome-gitlab-notifier/commit/9dd80ec3599b5af4933ae2b7fa1f0b7cbf70489e