define .source, .doc, etc on Pry::ClassCommand

This is so that Pry::CodeObject can return Pry::ClassCommand objects directly, this is impt
as we want slightly different behaviour than just Pry::WrappedModule(command_class), notably .doc should return
command help rather than comments above the command's class definition.

lib/pry/code_object.rb

@@ -70,7 +70,9 @@ class Pry
       if str !~ /\S#\S/ && target.eval("defined? #{str} ") =~ /variable|constant/
         obj = target.eval(str)
 
-        if obj.respond_to?(:source_location)
+        # restrict to only objects we KNOW for sure support the full API
+        # Do NOT support just any object that responds to source_location
+        if [::Proc, ::Method, ::UnboundMethod].any? { |o| obj.is_a?(o) }
           Pry::Method(obj)
         elsif !obj.is_a?(Module)
           Pry::WrappedModule(obj.class)

lib/pry/command.rb

@@ -506,6 +506,30 @@ class Pry
   # gems your command needs to run, or to set up state.
   class ClassCommand < Command
 
+    class << self
+      def source
+        Pry::WrappedModule(self).source
+      end
+
+      def doc
+        new.help
+      end
+
+      def source_location
+        Pry::WrappedModule(self).source_location
+      end
+
+      def source_file
+        Pry::WrappedModule(self).source_file
+      end
+      alias_method :file, :source_file
+
+      def source_line
+        Pry::WrappedModule(self).source_line
+      end
+      alias_method :line, :source_line
+    end
+
     # The class that couples together subcommands and top-level options (that
     # are known as "default" options). The explicitly defined instance methods
     # of this class provide the coupling with default options of a