added the octave IO module for the IO interface with hte octave files developped by PetaVision developers.
Casper image reconstruction in the rate model.
Added the functions for analysing and plotting the PetaVision data.
moved Casper image from tmp to data
added the demo for the functions which read, analyse and plot the PetaVision files.
added the notebook with spiking LCA in LGN architecture.
added 2 fuctions from the neurovivo.common to have LCA and neurovivo non-interdependent.
corrected the path to Casper image.