doc: clearly mention that CMake module file should be kept up-to-date.
ColladaImporter: using MeshTools::combineIndexArrays().

The function originated here and was just moved to core library to make
it useful on more places.
package: added debian package.

Again thanks to Costas Hatzis for the help.
ColladaImporter: test behavior for object with != 1 materials.

Both fail. I thought that at least the first one would pass somehow.
ColladaImporter: proper behavior for objects with != 1 materials.
package: update dependencies for debian package.
package: use qmake from Qt4 for finding Qt.

Why the hell can't FindQt4 do this on its own?! The devs need to patch
this _everywhere_.
Error out when compatibility branch is needed for particular compiler.
Merge branch 'master' into compatibility

Compiler compatibility checks are done in UseCorrade.cmake, thus we
don't need to duplicate these checks in here.

Conflicts:
	src/MagnumPlugins/ColladaImporter/ColladaImporter.cpp