Enhanced prompts with inquirer.js

i've changed prompts interaction with inquirer.js. categorize permissions and using list prompts.  inquirer.js is really cool. i think chromeapp generator also needs to update. but before questions should be re-arranged. chromeapps features has many changed. thought? @addyosmani 

![enhanced-prompts](https://f.cloud.github.com/assets/124117/659004/0a93c378-d648-11e2-87d2-a81b8ec5d72b.png)