Adds support for Debian 7 (Issue #1)

- Adds Debian 7 (wheezy) to the list of supported distributions
- Moves the disable ufw task from tasks/Debian.yml to tasks/Ubuntu.yml
- Modifies tasks/main.yml to include tasks/Debian.yml for both Ubuntu
  and Debian distributions, and to include tasks/Ubuntu.yml only for
  Ubuntu distributions
- Bumps the version from 1.0.2 to 1.1.0 to reflect the additional
  functionaly to support an additional Linux distribution