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.
No, it's a mix of renamed variables (anything coming directly from x$) and
variables we've generated in the function itself (age.type, geo.chron.type).

On Thu, Sep 25, 2014 at 9:15 PM, Gavin Simpson <notifications@github.com>
wrote:

> In R/get_geochron.R:
>
> > @@ -117,26 +117,25 @@ get_geochron <- function(datasetid, verbose = TRUE){
> >
> >            data.frame(sample.id = x$SampleID,
> >                       geochron.id = x$GeochronID,
> > -                   age.type.id = x$AgeTypeID,
> > -                   age.type = age.type,
> > -                   age = x$Age,
> > -                   e.older = x$ErrorOlder,
> > -                   e.young = x$ErrorYounger,
> > -                   delta13C = x$Delta13C,
> > -                   lab.no = x$LabNumber,
> > -                   material.dated = x$MaterialDated,
> > -                   geo.chron.type.id = x$GeochronTypeID,
> > -                   geo.chron.type = geo.chron.type,
> > -                   notes = x$Notes,
> > -                   infinite = x$Infinite,
> > -                   stringsAsFactors = FALSE)
> > +                     age.type.id = x$AgeTypeID,
>
> What is the intention here? (And elsewhere in this PR) Are you just
> renaming variables? Why not do that via a names() call rather than
> creating a new copy of the data frame?
>
> —
> Reply to this email directly or view it on GitHub
> <https://github.com/ropensci/neotoma/pull/143/files#r18071203>.
>