Function to Bulk Delete Indexed Badges

[kayaelle]

We need a function to remove badges in bulk. Discovery badges need to be pulled out of the directory because they're demo badges.

[jpcamara]

New #deleteByEndpoint method on elasticsearch. You can use it by going to the root of the project, typing node directory-repl.js

deleteByEndpoint('http://anendpoint.com', function () {});