Ensure that connected containers get a System in mapStateToProps props

This will allow us to avoid system utility handaround in
connected containers.

test/core/system/system.js

@@ -518,6 +518,59 @@ describe("bound system", function(){
       // Then
       expect(renderedComponent.text()).toEqual("This came from mapStateToProps and this came from the system and this came from my own props")
     })
+
+    it("gives the system and own props as props to a container's `mapStateToProps` function", function() {
+      // Given
+      class ContainerComponent extends PureComponent {
+        mapStateToProps(nextState, props) {
+          const { exampleSelectors, fromMapState, fromOwnProps } = props
+          return {
+            "fromMapState": `This came from mapStateToProps ${exampleSelectors.foo()} ${fromOwnProps}`
+          }
+        }
+
+        static defaultProps = {
+          "fromMapState" : ""
+        }
+
+        render() {
+          const { fromMapState } = this.props
+          return (
+            <div>{ fromMapState }</div>
+          )
+        }
+      }
+      const system = new System({
+        plugins: [
+          ViewPlugin,
+          {
+            components: {
+              ContainerComponent
+            }
+          },
+          {
+            statePlugins: {
+              example: {
+                selectors: {
+                  foo() { return "and this came from the system" }
+                }
+              }
+            }
+          }
+        ]
+      })
+
+      // When
+      var Component = system.getSystem().getComponent("ContainerComponent", true)
+      const renderedComponent = render(
+        <Provider store={system.getStore()}>
+          <Component fromOwnProps="and this came from my own props" />
+        </Provider>
+      )
+
+      // Then
+      expect(renderedComponent.text()).toEqual("This came from mapStateToProps and this came from the system and this came from my own props")
+    })
   })
 
 })