Centered colormap generator

Creates a colormap using two boundary colors and one center color. Useful in situations containing positive and negative values, where the central color (normally white) is zero. The user can define the boundary and center colors, and the number of segments in which the colormap is composed of. All color inputs must be in RGB triplet format (e.g. [0 0 0] for black). Once a colormap is generated, upload to current figure using: colormap(gca,newColormapName). Please see function text (comments) for further description and example usage. Very simple colormap generator, but please let me know if any bugs are present.