Outputs a color vector.
If the combined length of col and image is 2, and iters is greather than 1,
this function creates a gradient from first specified color to the second. The length of said
vector will be equal to iters.
If the combined length of col and image is greater than two, then the output will
be a vector of whatever was input into col and image with output length being
min(length(col) + length(image), iters).
colorVector(col, image, iters)A vector or list of colors
A vector or list of colors
A number indicating the number of iterations desired.
If set to greater than 1, iters becomes the length of the output.