fader now fades out last slide as it fades in new slide (so it looks better with slides of different sizes); also refactored out some duplicate code between slider and fader type
fader now fades out last slide as it fades in new slide (so it looks better with slides of different sizes); also refactored out some duplicate code between slider and fader type

bsweeney/PlusSlider,JamyGolden/PlusSlider,bsweeney/PlusSlider,bsweeney/PlusSlider,JamyGolden/PlusSlider,JamyGolden/PlusSlider