changing tests to new minor version
Merge pull request #28 from fike/issue_27

* Fix empty error with test for install command. refs #27
fixing error message on list
Merge branch 'master' of github.com:guedes/pgvm
fixes error message when first installing from repos

fixes #29
fixing error message on list
fixing typo [ci skip]

per report of Vinicius Segalin
Merge branch 'master' of git://github.com/guedes/pgvm into issue_3
Added travis test using only major version.