rubinius/rubinius — pull request #1759 by mpapis (2012-05-30 23:00:08+00:00)
Title: reset GEM_HOME & GEM_PATH to not install gems in currently used RVM ruby

reset GEM_HOME & GEM_PATH to not install gems in currently used RVM ruby

this problem was introduced in #1712 with commit bed9da6ff9d914087cf50c6269cf8e22a985216f

also fixes things for @michaelklishin / @travis-ci