Merge pull request #18 from n-lagomarsini/indexes

Modifications on the ChangeMatrix and Middleware processes
Merge pull request #19 from n-lagomarsini/indexes

Modifications on the SoilSealingImperviousnessProcess coefficient
Merge pull request #20 from n-lagomarsini/indexes

Added color to indexes 3/4
 - indexes 3 and 4 legends
Merge branch 'master' of https://github.com/geosolutions-it/soil_sealing
 - indexes 3 and 4 legends
Merge pull request #21 from afabiani/master

- indexes 3 and 4 legends
Modifications on the index 8 process