rjags removal and sampling fix

Hi Lorena,

It didn't look like jags was being used, and it was causing DEGReport to not be able to be run, so I removed it. I also added a fix for if you have a situation where you have a small number of genes and are asking for more samples than genes; this can happen for like test data. When that happens, a warning gets raised and it switches the sampling to be with replacement. Let me know what you think and if you think that is a reasonable solution.