Allow foreman_salt to run with foreman_setup

Required to fix the following error:

```
Bundler could not find compatible versions for gem "deface":
  In Gemfile:
    foreman_setup (>= 0) ruby depends on
      deface (< 1.0) ruby

    foreman_salt (>= 0) ruby depends on
      deface (1.0.1)
```
Merge pull request #13 from eLobato/patch-1

Allow foreman_salt to run with foreman_setup