Add Chakrabarthy's Basal Ganglia model
Updates
Add ipython notebook
 Added the arm model in numpy, without learning
Fix the model, not working
Clean version of the model, still not working
Added python and ipython files for learning in one simulation and multisimulations, script for compute and display the Propotion of Optimum trials and Display Cortical activity of 1 trial
Update the Curve fitting the data
Update the scripts for plotting the Proportion of Optimum Trials and a fitting curve
Merge pull request #5 from mtopalid/master

Added scripts for learning and multisimulations