QT : ex10 : MDI with Signal and slots

QT : ex10 : MDI with Signal and slots
Merge branch 'master' of github.com:tppi/Plataformas-de-Desenvolvimento-da-Aplicacoes

Conflicts:
	MDI_with_signals_and_slots/MDI_with_signals_and_slots.pro.user
	MDI_with_signals_and_slots/form.cpp
	MDI_with_signals_and_slots/form.h
	MDI_with_signals_and_slots/form.ui
	MDI_with_signals_and_slots/mainwindow.cpp
	MDI_with_signals_and_slots/mainwindow.h