1. yum install foreman-installer
   ...
   <..snip..>
   ...
   --> Processing Dependency: rubygem(mime-types) >= 1.16 for package: rubygem-rest-client-1.6.7-2.el6.noarch
   --> Finished Dependency Resolution
   Error: Package: rubygem-rest-client-1.6.7-2.el6.noarch (foreman)
   Requires: rubygem(mime-types) >= 1.16
   You could try using --skip-broken to work around the problem
   You could try running: rpm -Va --nofiles --nodigest

My work around is to use the package rubygem-mime-types from epel repo.