[IMP] store: connect function takes hash function in param

With this commit, we can now decides precisely if a component should be
rerendered, by using a hash function.

By default, the hash function will deep observe each store element
coming from the result of the mapStateToProps.

closes #24

src/component.ts

@@ -319,10 +319,6 @@ export class Component<
     nextProps: Props,
     forceUpdate: boolean = false
   ): Promise<void> {
-    if (nextProps === this.__owl__.renderProps && !forceUpdate) {
-      await this.__owl__.renderPromise;
-      return;
-    }
     const shouldUpdate = forceUpdate || this.shouldUpdate(nextProps);
     return shouldUpdate ? this._updateProps(nextProps) : Promise.resolve();
   }