Added report of active validators to status page.

The status handler now uses the activeValidators passed into it to create a report on that active validators running on the server.
Removing unstable node 11 from build matrix.
Merge pull request #26 from rhyolight/remove-node11

Removing unstable node 11 from build matrix.
Merge branch 'master' of github.com:numenta/nupic.tools into validators-in-status
Merge pull request #25 from rhyolight/validators-in-status

Added report of active validators to status page.