GNU Tar has `--preserve-permissions` as a default enabled when executed as the superuser (root).
This will cause the binaries to be installed using the permissions (owner and group) as defined in the tarball.
The argument `--no-same-owner` prevents this and will install the binaries as the effective owner/group just like when nvm is executed as a non superuser.
Updated the install from binary test from the installation_node test
suite because this test is run in a docker container as root. Without
--no-same-owner this test will fail beause the binaries of node v0.10.7
are owned by isaacs/admin in the tarball.
