turn on MOAISim histogram report to point out memory leaks

Hanappe sample scenes don't call onDestroy(), the scroller scene increments
MOAICoroutine count by 1 and MOAIProp count by 200+.
example of failing onDestroy()

When exiting scoller example scene:

./hp/gui/Scroller.lua:316: attempt to index a nil value
stack traceback:
        ./hp/gui/Scroller.lua:316 in function 'scrollBoundaries'
        ./hp/gui/Scroller.lua:330 in function 'isPositionOutOfBounds'
        ./hp/gui/Scroller.lua:63 in function 'updateScroll'
        ./hp/gui/Scroller.lua:48 in function 'func'
        ./hp/util/Executors.lua:17 in function <./hp/util/Executors.lua:15>
Merge pull request #30 from robertwahler/check_memory

Hanappe sample scenes need onDestroy() examples