added sjcl entropy for issue 177 ...Sjcl177

3rd approach worked.

1) first approach tried to add it into sjcl into bundle.js caused a conflict

2nd approach tried to use the sjcl node module but was unable to get the collectors started appropriately.

3rd attempt but the sjcl.js into the index.html for the test.  probably not a good long term approach but it works, the library may need to be loaded by the browser to work, not sure.  feedback?