Add back "index_buffer" as a deprecated module
Add back "index_buffer" as a deprecated module

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