Finding consistency between classes.

This standardizes most function variable and list names to `lower.case` format.  Fixes minor bugs and creates `*_list` classes for datasets as well as downloads.  Bugs remain.
Okay.  So I'll rename each of the method calls using `x`, which is what I
call at the top.

On Thu, Sep 25, 2014 at 9:14 PM, Gavin Simpson <notifications@github.com>
wrote:

> In R/get_download.R:
>
> >
> >    aa <- get_download(datasetid)
> >
> >    aa
> >  }
> > +
> > +#' @export
> > +get_download.dataset_list <- function(dataset, verbose = TRUE){
>
> You are forgetting that methods *must* have the same named arguments as
> the generic. Hence you can't have the dataset_list method have first
> argument dataset and the site method have first argument site (see below)
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/ropensci/neotoma/pull/143/files#r18071176>.
>