Hammer CLI

Hammer plugin for the Foreman no longer supports ruby 2.0, there's no point of keeping the historical code.

From my search there's following places containing some compatibility code that should be removed:

./hammer/hammer-cli-foreman/lib/hammer_cli_foreman/option_builders.rb:
   93  
   94      def unique(resources)
   95:       # ruby 1.8 hack - it does not support passing blocks to Array#uniq
   96        resources.inject({}) do |h, r|
   97          h.update(r.name => r)

./hammer/hammer-cli-foreman/Gemfile:
    4  
    5  gem 'gettext', '>= 3.1.3', '< 4.0.0'
    6: if RUBY_VERSION < '2.1.0'
    7    gem 'fast_gettext', '< 1.2.0'
    8  end