[Qgis-developer] Visual changelog for 2.8

[Nyall Dawson]

Hi all,

I've just done a quick trawl through the git changelog for 2.8 and
added shell entries to the visual changelog for noteworthy changes.
(My apologies if I accidentally skipped anything!)

Like for 2.6, these are just rough copy+paste notes from the git
commit messages, so I'm now asking for people to go in and flesh out
these entries to make them suitable for the final version, add
screenshots, etc.

Cheers,

Nyall