Allows CustomPaletteBuilder to deal with gray images
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                 Key: GEOT-3456
                 URL: http://jira.codehaus.org/browse/GEOT-3456
             Project: GeoTools
          Issue Type: Bug
          Components: core coverage
    Affects Versions: 2.7-RC2
            Reporter: Daniele Romagnoli
            Assignee: Daniele Romagnoli
             Fix For: 2.7.0, 2.8-M1


The actual CustomPaletteBuilder doesn't make any check on the input number of 
bands.
When setting up the palette's node it simply takes rgb[0], rgb[1], and rgb[2].
Being a gray image, a single band image, there is no rgb[1], rgb[2]... We 
should add more checks and logics to deal with gray images.

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