Merge pull request #71 from az0/master

Minor copy editing
Merge pull request #74 from az0/master

Remove executable permissions from .R, .Rd, .png, and similar files
drop = FALSE bug was fixed
replaced class.ind

I was referencing a function from the nnet package and wrote my own
instead
fixed for classification
updated based on Andrew Ziem's suggestion
notes and code for new caret releases
initial version
updated to work with formula method
initial version