Make glowwindow and glowutils optional
Remove glowutils dependency of glowwindow
Merge branch 'master' into optional_glowwindow_and_glowutils
Merge branch 'master' into optional_glowwindow_and_glowutils

Conflicts:
	source/CMakeLists.txt
Merge pull request #210 from hpicgs/optional_glowwindow_and_glowutils

Optional glowwindow and glowutils