Revert "Fix #2115 Clean AUFS references. Also fixes some links to client libraries and mongo example."

This reverts commit f4c17a202b5f6021d48c3cb3342c37607b509630.
Merge pull request #2250 from dotcloud/revert-07-doc-changes

Revert "Fix #2115 Clean AUFS references. Also fixes some links to client...