Make help use Slop where possible

lib/pry/command.rb

@@ -197,6 +197,8 @@ class Pry
         args.values_at *(0..(arity - 1)).to_a
       end
     end
+
+    def help; description; end
   end
 
   # A super-class ofr Commands with structure.
@@ -232,6 +234,11 @@ class Pry
       end
     end
 
+    # Return the help generated by Slop for this command.
+    def help
+      slop.help
+    end
+
     # Return an instance of Slop that can parse the options that this command accepts.
     def slop
       Slop.new do |opt|

lib/pry/command_set.rb

@@ -286,7 +286,7 @@ class Pry
           stagger_output(help_text)
         else
           if command = find_command(cmd)
-            output.puts command.description
+            output.puts command.new.help
           else
             output.puts "No info for command: #{cmd}"
           end