Merge pull request #1 from brian-bot/master

first pass at organizing content into R package construct
new default values and warnings
.IClm renamed to .confInt
check y-range removed. targets are yFit. estimates colnames: 'Prop' replaced by 'y'
updates in called functions
typos
y-values have to be in the range defined by bottom and top asymptotes. If not, out-of-range values are replaced + warning
move to nplr name instead of nplogistic