title: Choose between Yii 1, Yii 2 and latest Yii Gihub commit for a new project
body: <p>We are about to start a new project and we want to use Yii for it. After reading Yii website, I found out that the release date for Yii 2 beta has been set to early 2014 and judging by github, that milestone is 94% ready.</p>
  
  <p>What is our best bet in this case when choosing Yii version? If we go with stable Yii 1, is it going to be easy to later update that code to Yii 2.0 or is it going to be a complete rewrite or some bad hack? Or if we go with Yii 2.0 alpha, will it be relatively easy to update then? The instability of alpha is ok, we anyway will likely be working on basic things such as authentication, registration, etc by the time beta is released? And finally is using the latest github commit (which is a 94% complete beta) a good idea or is it in a semi-functional "development" state and might not work at all?</p>
  
  <p>Also how compatible are the Yii extensions? If we go with Yii 2, are we going to be limited to a relatively small selection of Yii 2 extensions?</p>