Qt5: Add flag that informs paintEvent if the agg buffer needs to updated, fix rubberband#4962

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pwuertz wants to merge 3 commits intomatplotlib:masterfrom

pwuertz:qt5_agg_redraw_flag

Commits on Aug 20, 2015

Qt5: Add flag that informs paintEvent if the agg buffer needs to updated, init FigureCanvasQTAggBase
pwuertz
committed
Add handler for removing the rubberband when zoom is released
pwuertz
committed
Fix rubberband removal in Qt backend
pwuertz
committed