ISO for 2015-04-24

[Harald Sitter]

http://files.kde.org/snapshots/unstable-amd64-latest.iso.mirrorlist

This ISO was created using the Plasma/5.3 branch as of earlier today.
Which roughly approximates what is eventually going to become 5.3.0
next week. After release the ISO is then switching back to git master
branches for next friday.

# changes
- installer window decoration doesn't render black anymore

# errata
- installer window decoration uses !breeze colors. fix discussed;
needs implementation in the installer code itself.
- extra software that is not marked for stable integration (notably
everything that isn't frameworks|plasma|applications) is not available
for installation. if a certain package can not be installed chances
are that it only has an unstable build and will need the unstable
archive added with sudo apt-add-repository ppa:kubuntu-ci/unstable &&
sudo apt update. do note that this will however also bring in plasma
master builds.

# long standing errata
- the ISO is rolled using the CI landing PPA due to stabilization
blockage from missing bluez5. this in turn means that upgrades
potentially won't work or break half way through as the underlying PPA
breaks ever so often.
^ Work on tech to resolve this has been started