raster styler bugs, missing features

[ ] raster styler is open if a layer has been selected before styler is opened
[ ] something wrong with the way we set val + 1 stop... we have to look more at this, it doesn't turn out as nice, somehow. (@jorgenevil kan vise deg et eksempel til uka) This has to do with blur I think (ie. raster-scaling: gaussian;)
Minor features
[ ] tabbing in styler list - would be nice to be able to [tab] into the next input
[ ] not possible to dblclick outside of last stop. (not really a bug, but counter-intuitive)
[ ] set type of stop (exact, linear, etc.) https://github.com/mapnik/mapnik/wiki/RasterColorizer#modes
[ ] add different min/max values than 0-255 (needs server-side checking of range in raster)
[ ] set blur or no blur (raster-scaling: gaussian;)

systemapic / systemapic.js