modules: updated FindMagnum.cmake.
No need to find Magnum in every corner.
Updated toolchains submodule.
Merge branch 'master' into compatibility
Require at least CMake 2.8.8 everywhere.
Make all constructors explicit by default.
Use threaded shader compilation everywhere.
bullet: prefix member variables with underscore.
cubemap: prefix member variables with underscore.
primitives: prefix member variables with underscore.
text: prefix member variables with underscore.
textured-triangle: prefix member variables with underscore.
triangle: prefix member variables with underscore.
viewer: prefix member variables with underscore.
Adapted to Magnum changes.
text: minor cleanup
Merge branch 'master' into compatibility

Conflicts:
	src/viewer/ViewerExample.cpp