Link to inquirer docs for prompt api

[danielchatfield]

Yeoman uses https://github.com/SBoudrias/Inquirer.js/ for the prompt but doesn't have a very comprehensive documentation of all the available options.

I think the best solution is to link to the inquirer docs somewhere as currently you have to look at the source to find out which library is being used.

[passy]

Good call.

@stephenplusplus Could you add a sentence or so to the generator tutorial?

[addyosmani]

In response to another issue about this a mention of Inquirer has been added to the generator docs and is now live.