Add ledRing() to OPC.pde

examples/processing/grid24x8z_clouds/OPC.pde

examples/processing/grid24x8z_dot/OPC.pde

examples/processing/grid24x8z_flashy_rings/OPC.pde

examples/processing/grid24x8z_rings/OPC.pde

examples/processing/grid24x8z_rings_leapmotion/OPC.pde

examples/processing/grid24x8z_sequencer/OPC.pde

examples/processing/grid24x8z_text/OPC.pde

examples/processing/grid24x8z_waves/OPC.pde

examples/processing/grid32x16z_attractor/OPC.pde

examples/processing/grid32x16z_dot/OPC.pde

examples/processing/grid32x16z_particle_fft/OPC.pde

examples/processing/grid32x16z_particle_fft_input/OPC.pde

examples/processing/grid32x16z_red/OPC.pde

examples/processing/grid32x16z_rings/OPC.pde

examples/processing/grid32x16z_rings_lamp/OPC.pde

examples/processing/grid32x16z_video/OPC.pde

examples/processing/grid32x16z_wavefronts/OPC.pde

examples/processing/grid32x16z_wavefronts_leapmotion/OPC.pde

examples/processing/grid8x8_dot/OPC.pde

examples/processing/grid8x8_noise_simple/OPC.pde