Refactor: inline anticipates into expects

This reduces the surface area of the internal API exposed to users as
suggested in #467

lib/mocha/object_methods.rb

@@ -73,7 +73,12 @@ def stubba_method_for(method_name)
     #
     # @see Mock#expects
     def expects(expected_methods_vs_return_values)
-      anticipates(expected_methods_vs_return_values)
+      if frozen?
+        raise StubbingError.new("can't stub method on frozen object: #{mocha_inspect}", caller)
+      end
+      mocha.anticipates(expected_methods_vs_return_values, caller) do |method_name|
+        Mockery.instance.stub_method(self, method_name)
+      end
     end
 
     # Adds an expectation that the specified method may be called any number of times with any parameters.
@@ -105,7 +110,7 @@ def expects(expected_methods_vs_return_values)
     #
     # @see Mock#stubs
     def stubs(stubbed_methods_vs_return_values)
-      anticipates(stubbed_methods_vs_return_values).at_least(0)
+      expects(stubbed_methods_vs_return_values).at_least(0)
     end
 
     # Removes the specified stubbed methods (added by calls to {#expects} or {#stubs}) and all expectations associated with them.
@@ -137,16 +142,5 @@ def unstub(*method_names)
         mockery.stubba.unstub(stubba_method_for(method_name))
       end
     end
-
-    private
-
-    def anticipates(expected_methods_vs_return_values)
-      if frozen?
-        raise StubbingError.new("can't stub method on frozen object: #{mocha_inspect}", caller)
-      end
-      mocha.anticipates(expected_methods_vs_return_values, caller) do |method_name|
-        Mockery.instance.stub_method(self, method_name)
-      end
-    end
   end
 end