Update Golf, ode case studies

[WardBrian]

• Golf: Just re-knit
• ODE: Text itself updated. Source updated here

[jgabry]

These look good, except for one small thing in the golf html. When fitting some of the models (but not all, don't know why) we now get the following message:

code for methods in class "Rcpp_stan_fit4model11fb41afc2988_" was not checked for suspicious field assignments (recommended package 'codetools' not available?)

I don't get these messages when running the models, so I'm guessing this is some Rcpp thing that only shows up if you don't have the codetools package installed.

I can try generating the html and if it comes back clean I'll push it to this branch.

[jgabry]

Ok yeah when I generated the html I didn't get those weird messages, presumably because I had codetools installed. I updated the branch and will merge now.