title: developing Laravel 3 and laravel 4
body: <p>Does application build on Laravel 3 work on Laravel 4?</p>
  
  <p>In few days ago I found Laravel and now I try to learn it. Am I losing time learning Laravel 3 when Laravel 4 is coming? Is this a same with some addons in LV4? And would my application build in LV3 work in LV4?<br>
  Where and how to start learning LV4?</p>