Save voltage and neurostimulation response

[tdowrick]

In GitLab by @DavidPerez-Suarez on Jul 23, 2019, 18:40

Add voltage and neurostimulation response to the output json file.
Related with #73

[tdowrick]

In GitLab by @DavidPerez-Suarez on Jul 23, 2019, 18:40

changed due date to August 02, 2019