Changed worflow arg names to simply model, covariate etc.
Added extra roxygen2 doc for RunModels argument
 commented out workflow examples. Just a pain.
New workflow syntax as discussed at workshop.
Now give modules unquoted. If parameters give like a function.
Closes #40
Closes #30 (might have been in previous commit, but cannot find it.)
Redocumented. Removes export of ModuleOptions etc.
Removed ModuleOoptions tests