Added initial testing for images favorite status
Implemented bucket base_folder for Images

This fix #17 by adding a new configuration flag in settings.yml. This
way, it's possible to use a namespace to isolate your blog in a bucket.

This makes possible for a user to share a bucket with different
application.
Changed CSS rules to make things prettier

Used to have background-size: 100% auto; but it would end up being messy
on different resolution so I decided to use cover which scale the images
to make sure it takes the whole width & height
Merge branch 'master' into pothibo.com