Export code - first working implementation!

Details:
-pass all TextureParams into ExportCode
-CombineParams now takes numChannels as an arg
-TextureCombiner.getCombineParams now public
-ColorSpectrum.get routines are now static
-removed ColorSpectrum.getARGB to avoid accidental wrong index
-added Sumio to the BSD license header
Renamed ColorSpectrum to ColorMap

Other:
-ColorMap.calculateARGB is now public static
Removed obsolete code template pieces from tutorial

Other:
-adjusted message in Java code template
-added Sumio to contributors in intro
-updated tutorial references to code template