expose GlObject trait, for inter-op with external libraries that require OpenGL ids
expose GlObject trait, for inter-op with external libraries that require OpenGL ids

christopheraugustus/glium,tomaka/glium,carbidegames/glium,cpjreynolds/glium,nicokoch/glium,rozaliev/glium,binsoftware/glium,caldwell/glium,TyOverby/glium,acolley/glium,sdotz/glium,bvssvni/glium,msiglreith/glium,glium/glium