Updated AbstractShaderProgram documentation.
Updated AbstractShaderProgram documentation.

 * #version directive doesn't belong to shader sources, since it is
   specified in Shader constructor.
 * It's not needed to call use() before setUniform() anymore.

DerThorsten/magnum,DerThorsten/magnum,DerThorsten/magnum,ashimidashajia/magnum,ashimidashajia/magnum,DerThorsten/magnum,ashimidashajia/magnum,ashimidashajia/magnum,ashimidashajia/magnum,MiUishadow/magnum,MiUishadow/magnum,MiUishadow/magnum,MiUishadow/magnum,DerThorsten/magnum,MiUishadow/magnum,MiUishadow/magnum