.travis: first version of a commit
travis: install R
travis: add user to staff group so it can install R packages
travis: fix adduser cmd, make script exit immediately on failure
travis: really exit when command fails
travis: debug print
travis: move setup from before_install to script
travis: see if newgrp will fix it
travis: another group workaround
travis/setup.sh: R fixups

1. Fix the setup.R for plyr dependency
2. Fix the travis script for the R DBI dependency
setup.sh: comments and exit on failure
travis: install rcpp from apt
travis: try to use upgraded Rcpp and DBI
travis: try installing R dependencies
travis: update Rcran mirror first
travis: update before install
travis: ubuntu key fixes
travis: switch to lucid R repo
travis: er, I meant precise
setup.R: remove Rcpp now that RCRAN is fixed