added support for ROLESPEC_ANSIBLE_OPTS variable to pass additional options (e.g --skip-tags) to Ansible
fixed a bug that caused multiple tests to be selected if multiple tests start with the same prefix
Revert "added support for ROLESPEC_ANSIBLE_OPTS variable to pass additional options (e.g --skip-tags) to Ansible"

This reverts commit 53ef483499ba28eb4a63dec840a5d82be9e0c2fb.
Merge pull request #5 from asmartin/master

Fix bug for selecting roles when roles have the same prefix