This is a tricky bug. The problem is that a ConnectedComponent can
trigger a rendering before it is aware that there is a state change in
the store, and just before the store update event comes in.
What we do in this commit is to update the storeProps whenever a
rendering is scheduled. However, we need to keep the rendering
information as a promise to give it in some case to the __checkUpdate
method (see the note in the render method)
closes#268
Géry Debongnie