Added an env var check to prevent a dist-upgrade during bootstrap, since this could pull in a new kernel on people that don't want one.
Hopefully fixing a problem I introduced in 74d5831310fce5b070ea6f7493e8f88db2f6213f whereby I was clobbering any cap task that had an :only option supplied.
jruby-head is about to get rocky, so allow failures on it.
It seems rbx-18mode is having problems after some rbx upgrade on Travis.
Merge branch 'master' of github.com:rubber/rubber
Change digital ocean create to not use Rubber.env when naming droplet