Don't add leading slashes to S3 keys
Add buildout file to clean old eggs
Use the right python version
Code style
Add a leading slash on folder for all cache type
Use join to join path and file
Update the tests
Add controller attribute
Add a trailing slash in the http_url of the caches.

Also remove leading slash where it should be removed.
Merge pull request #198 from sbrunner/no-leading-slash-in-s3-keys2

Don't add leading slashes to S3 keys