cmake: Install FindGLM
cmake: Don't abort if not testing

This prevents installing and is quite antisocial.
cmake: Don't build tests when not testing
cmake: Don't use unqualified include paths
Fixed non-utf8 character #196
Fixed non-utf8 character #196
Merge pull request #189 from rleigh-dundee/cmake-install

cmake: Several fixes to the build system #189
Updated readme for GLM 0.9.5.4 with #189
Fixed GTX_color_space - saturation #195
Fixed GTX_color_space - saturation #195
Added test gor issue #199
Merge 0.9.5