Merge pull request #18 from eddelbuettel/sandbox

Sandbox -- merge 2014-10-02
Merge pull request #21 from eddelbuettel/sandbox

merge current Sandbox state to trigger updated builds
Merge pull request #26 from rocker-org/sandbox

Sandbox
Merge branch 'feature/newlittler'
set en_US.UTF8 locale
explicitly declare --deps TRUE in install2.r
update README
Merge branch 'sandbox' of github.com:rocker-org/rocker into sandbox