Simplify install leave NAMESPACE file in git so devtools aren't needed by users to install package.

If you remove NAMESPACE from your .gitignore people will be able to install the package by:

install.packages('devtools')
library(devtools)
install_github('SGAT','SWotherspoon') 

Much easier than your current instructions.

You can test with:
install_github('SGAT','jduckles')