Update README.md
Added some debug output to get the OSX install working. Added 'brew update' as recommend by travis-ci
Update travis-tool.sh
Changed to read the R pkg from CRAN and install that.
Commented out homebrew install because that seems like a harder way to get R on travis-ci.
Added sudo to package installer invocation
Commented README and .travis.yml. Left in the OS X build.
clean up