Update documentation according to 3.0 changes

[mmnosek]

After releasing 3.0, documentation has to be updated. There's a lot from ASP.NET, so we should link to this docs at right places.

[warpech]

I think this was fixed in 4d04e0a, 7670f61.

@mmnosek can you confirm?

[mmnosek]

Nope. Look at master branch. We need the same information in 3.x