Go back to rbenv, add in a deploy user

rvm had caused me a bunch of conflicts on further chef runs.  For now
using rbenv will fight that can of worms when I've got everything else
nailed down.  I think it simply means making certain users immune from
rvm's system wide install.  Or installing it non-system wide.  Or just
not autoloading it for all users.

Using the user community cookbook I had to use chef-solow-search and
chef-handler to get things right.