[Releasing] [Development] Qt 5.0 alpha released

[Rohan McGovern]

simo.falt at nokia.com said:
> Moi,
> I can't provide you an easy way but I can show you a way to get the alpha
> out of git (see below). But yes, it is true that there isn't any tag in
> git but I hope we will fix that in future releases.

Hmm, it's not too late to fix it for _this_ release though.
There's nothing stopping us from preparing and pushing 5.0.0-alpha tags
now?