Part of #56's push to switch examples away from the cxxfunction to Rcpp
Modernizing FastLM and functionCallback
Thanks for bringing the current RcppArmadillo version in. With the work I did for RcppGSL some, oh, 14 or 15 months ago we can make that one better too (no more alloc() and free() !!) and I'll get to that.
@eddelbuettel: I'll rewrite and submit a PR using those model types tonight.