Revert "XCOMMONS-341: Upgrade to Restlet 2.1.1"

This reverts commit 43e57bd7e3be5f03e5dae699b370572698f816fb.
Revert "XCOMMONS-341: Upgrade to Restlet 2.1.1"

This reverts commit 0995b9acd68024cb7d7eb1a1e5855c16d5e4bfda.