Move default cran repo to systemwide file in r-base
remove setting cran repo in rstudio and hadleyverse
Uses most recent RStudio version, closes #13
minor tweaks

- do not install gdebi when we can use dpkg -i
- do not install wget which r-base already installs
Update README for ubuntu packages, note on trademark
Merge branch 'sandbox' of github.com:eddelbuettel/rocker into sandbox
newline, update, and alphabetize (#17)
newline, update, and alphabetize (#17)
minor tweak to also remove tempfile, update email address
set both our names in Maintainer
Merge pull request #18 from eddelbuettel/sandbox

Sandbox -- merge 2014-10-02