Vagrant-Berkshelf 3.0 is out.
Added metadata attribute.
Revert "Added metadata attribute."

This reverts commit c9eadd65c2109c30e26161a8746001442bf5b516.
Fixed berkshelf setup.

* Fixed and updated lock file.
* We now require berkshelf >= 3.1.1
* Using forked buildbot cookbook.
Updated example node.
Merge pull request #19 from rhabbachi/master

Fix berkshelf lock file.