Move event handling of a couple prompt to use RxJS
Finish basic move of user event logic to RxJS
Update input validation flow to rxjs
Move validation handling to Observable for input, password and confirm prompts
Cleanup expand prompt
Validate rawlist prompt using Observables
Simplify util.runAsync
Move prompt orchestration to RXjs
Fix async series issue
Extract common logic from the prompt runner
Expose Reactive interface through to process property
Add support for passing an observable as questions
Add small doc for the options Rxjs offers
Merge pull request #137 from SBoudrias/rxjs

Using Rxjs (Fix #131)