3.0 Beta released

We just made a beat release of version 3.0. We are still testing it but we believe that it is good enough for a beta version.

For 2.x users, you should be able to transfer your application to 3.0 without any changes. However, before the final 3.0 release is out, we will still keep updating 2.x release. Right now we have a 2.4 version.