Added color ramps for pollution modelling raster representation
Add new tileindex layer for raster wmstime'
Create tif images from asciigrid with specific color ramps
Changed raster file destination folder url written in tileindex table
Adapt color ramps to meteotest model
Add field for path to asciigrid
Merge pull request #15 from monodo/generate_continous_colored_maps

Generate continous colored maps