qmake: In a server-only build, don't link to the libassimp binary
Builder|Ubuntu: Added a source-only builder for 14.04 LTS

The packages for Trusty are available via the sjke/doomsday PPA.
Builder|Fixed: Packaging stable source packages for Ubuntu

To allow stable packages to not be replaced by later builds in
the PPA, they are now named "doomsday-stable" rather than just
"doomsday".
Builder|Debian: Package name substituted in package control file
Builder|OS X: Use command line tools to create installer package

PackageMaker is obsolete nowadays, the command line tools pkgbuild
and productbuild are supposed to be used instead.
Homepage: Updated Windows download page

No more support for Windows XP and OpenGL 2.0 required.
Fixed|UI|Client: Fatal error when activating splitscreen (viewgrid)

The "ui/background" material no longer exists, as the UI is being
drawn by libappfw and (at least presently) it has no ties to the
material subsystem.

Replaced the obsolete UI background drawer with a black quad.
Merge branch 'master' into revise-map-geometry-generation