[Development] Setting up time-based releases for the project

[joao.abecasis at nokia.com]

Thiago Macieira wrote:
> Thanks for putting it together. I like it. It's what we had discussed over a
> year ago and it makes sense to me.

For context, I proposed this setup internally before. The beginning of Qt 5's
development made most of the proposal temporarily mute.

It is now a good time to pick up the discussion out here in the open ;-)


João