AnimationGadget : snap keys to integer frames
AnimationGadget : snap keys to integer frames

We've had problems with keys ending up slightly off integer frames, which caused
two keys to live right next to each other when the user uses the NodeEditor to
set a keys exactly on an integer frame.

andrewkaufman/gaffer,lucienfostier/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,hradec/gaffer,ImageEngine/gaffer,boberfly/gaffer,appleseedhq/gaffer,hradec/gaffer,ImageEngine/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,appleseedhq/gaffer,hradec/gaffer,lucienfostier/gaffer,GafferHQ/gaffer,hradec/gaffer,hradec/gaffer,appleseedhq/gaffer,boberfly/gaffer,lucienfostier/gaffer,johnhaddon/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,GafferHQ/gaffer,ImageEngine/gaffer,ImageEngine/gaffer,andrewkaufman/gaffer,appleseedhq/gaffer,andrewkaufman/gaffer,lucienfostier/gaffer,johnhaddon/gaffer,boberfly/gaffer,johnhaddon/gaffer,boberfly/gaffer