Update jquery.color.d.ts

red, green, blue, alpha, hue, saturation, lightness all accept a string parameter in the format of "+=100" or "-=100" as per https://github.com/jquery/jquery-color/

red()             // returns the "red" component of the color ( Integer from 0 - 255 )
red( val )        // returns a copy of the color object with the red set to val
green()           // returns the "green" component of the color from ( Integer from 0 - 255 )
green( val )      // returns a copy of the color object with the green set to val
blue()            // returns the "blue" component of the color from ( Integer from 0 - 255 )
blue( val )       // returns a copy of the color object with the blue set to val
alpha()           // returns the "alpha" component of the color from ( Float from 0.0 - 1.0 )
alpha( val )      // returns a copy of the color object with the alpha set to val
hue()             // returns the "hue" component of the color ( Integer from 0 - 359 )
hue( val )        // returns a copy of the color object with the hue set to val
saturation()      // returns the "saturation" component of the color ( Float from 0.0 - 1.0 )
saturation( val ) // returns a copy of the color object with the saturation set to val
lightness()       // returns the "lightness" component of the color ( Float from 0.0 - 1.0 )
lightness( val )  // returns a copy of the color object with the lightness set to val
// all of the above values can also take strings in the format of "+=100" or "-=100"