The #[vertex_format] macro now correctly calculates offsets
The #[vertex_format] macro now correctly calculates offsets

Close #23

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