Move grunt task into tasks/grunt/prompt.js AND fix install prompt not showing

[pilsy]

It's because the cleverstack-cli looks for prompt:cleverAuthConfigPrompt - but in our task we have prompt:cleverAuthConfig - fix that

[pilsy]

Install prompt is actually not working because there is no Gruntfile.js in this module, i need a way of loading the individual grunt files from the tasks/grunt/ folder