Revert "misleading script removed"

This reverts commit 616271ecc350f266f740f714b64e6cde23dc26f8.
and renames the file to install_eirods.sh.

It doesn't matter much what kind of irods version it is,
because it's for testing only, and the API is compatible.
(as far as I know)
Also updated the .travis.yml accordingly.