Update pretrained models. support for yuv420 jpeg

models/vgg_7/art/scale2.0x_model.t7

@@ -204,7 +204,7 @@ V 1
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@@ -430,7 +430,7 @@ V 1
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@@ -656,7 +656,7 @@ V 1
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@@ -882,7 +882,7 @@ V 1
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