Main general fixes:
-We can insert fragment with dinamic amount of views via xml.
-We have unified handler in xml for fragment
-We can handle events from Fragment inside Fragment Class logic
-We can rotate screen
Still need to fix:
- avoid a proxy-method in main activity (which handle Fragment's events)
now we have a next sequence:
Fragment's element event(click button in Fragment)  -> call MainActivity Fragment handler -> call FragmentHandler