Add option name auto-complete for gset and gunset commands

Closes #34

Author: rastating

lib/cli/auto_complete.rb

@@ -34,6 +34,8 @@ def refresh_autocomplete_options
 
       @autocomplete_list['set'] = opts_hash
       @autocomplete_list['unset'] = opts_hash
+      @autocomplete_list['gset'] = opts_hash
+      @autocomplete_list['gunset'] = opts_hash
     end
 
     def build_cmd_list