Updated FindCorrade.cmake from Corrade repository.
Adapted to Magnum changes.
Merge branch 'master' into ports
Adapted to Magnum changes.

Explicitly check for pressed button in mouseMoveEvent() to avoid
unwanted rotations in toolkits with passive move events.
Adapted to Magnum changes.

viewportEvent() might not be called at all if the window doesn't change,
properly configure everything during initialization.
Merge branch 'master' into ports

Conflicts:
	src/primitives/PrimitivesExample.cpp
Updated toolchains submodule.
Merge branch 'master' into ports
Cleaned up HTML markup and renamed it to indicate it belongs to NaCl.
Initial work on Emscripten porting.
triangle: ported to Emscripten.
primitives: ported to Emscripten.
viewer: can't run in Emscripten yet.