added some unittests for simple 2-layer convolutional nets
added some unittests for simple 2-layer convolutional nets

pimms/DeepCL,hughperkins/DeepCL,MiniLight/DeepCL,Peilong/DeepCL,pimms/DeepCL,pimms/DeepCL,Peilong/DeepCL,MiniLight/DeepCL,FighterLYL/DeepCL,MiniLight/DeepCL,FighterLYL/DeepCL,Peilong/DeepCL,Peilong/DeepCL,FighterLYL/DeepCL,FighterLYL/DeepCL,hughperkins/DeepCL,pimms/DeepCL,hughperkins/DeepCL,FighterLYL/DeepCL,mrgloom/DeepCL,mrgloom/DeepCL,mrgloom/DeepCL,MiniLight/DeepCL,MiniLight/DeepCL,mrgloom/DeepCL,mrgloom/DeepCL,hughperkins/DeepCL,pimms/DeepCL,Peilong/DeepCL,hughperkins/DeepCL