Revert "Moved libuv plugin to couchnode."

This reverts commit 2974965da5a18186f46ca19ab68223f39a8eeac1.

Change-Id: I5204ad925263cbecc2b8e5c1f89515509dd92a24
Add node v0.11 support.

Change-Id: I076aad52a12349417c33808dba25798211839fd9