Are we going to include random walk metropolis algorithm in 2.0?  If not, I think we should leave out this option.  Now it does nothing. 

```
$ ./dogs data=dogs.data.R sample algorithm=rwm
 method = sample (Default)
   sample
     num_samples = 1000 (Default)
     num_warmup = 1000 (Default)
     save_warmup = 0 (Default)
     thin = 1 (Default)
     adapt
       engaged = 1 (Default)
       gamma = 0.050000000000000003 (Default)
       delta = 0.65000000000000002 (Default)
       kappa = 0.75 (Default)
       t0 = 10 (Default)
     algorithm = rwm
       rwm
 id = 0 (Default)
 data = dogs.data.R
 init = 2 (Default)
 random
   seed = 2782807371
 output
   file = samples.csv (Default)
   append_sample = 0 (Default)
   diagnostic_file =  (Default)
   append_diagnostic = 0 (Default)
   refresh = 100 (Default)

Random Walk Metropolis Monte Carlo
$
```