feature: rhel-7 support

- add: tasks for redhat
- update: tasks
- update: vars
- update: tests
- update: simplify usage

- fixes: #8
- fixes: #7
- fixes: #2

fix: webui.json overwritten

fixes: #4

fix: variable missmatch

- fixes: #1

fix: variable misspelled

feat: parallel testing in travis

- update: .travis.yml
- update: molecule.yml
- update: README.md

fix: travis needs priv