Tonel loader should refresh selectors cache after loading

[marianopeck]

Right now, when you load something with Tonel, the new selectors are not "registered" in the system / IDE / Sts and hence, if you look for implementors you cannot find them, when you browse a just loaded class you see warnings because it thinks selectors don't exists, etc.... If you run explicitly StsPowerTools primRefreshMethodSelectors. then all selectors do appear. So... I think Tonel loader should somehow do this automatically as Envy does when you load something.