colormap does not space colors differently for different n

[willwhitney]

image.colormap should return colors that are further away from each other if there are only a few colors needed, i.e. colors should be evenly spaced around the hue wheel.

However, the tensor returned is identical for any n given. It always returns a truncated copy of the same tensor.

th> image.colormap(4)
 0.6500  0.3500  0.3500
 0.7056  0.5617  0.2944
 0.6044  0.7611  0.2389
 0.2150  0.8167  0.1833
[torch.DoubleTensor of size 4x3]

th> image.colormap(12)
 0.6500  0.3500  0.3500
 0.7056  0.5617  0.2944
 0.6044  0.7611  0.2389
 0.2150  0.8167  0.1833
 0.1278  0.8722  0.5744
 0.0722  0.7139  0.9278
 0.0167  0.1133  0.9833
 0.5189  0.3111  0.6889
 0.7444  0.2556  0.6467
 0.8000  0.2000  0.2900
 0.8556  0.5000  0.1444
 0.7878  0.9111  0.0889
[torch.DoubleTensor of size 12x3]