Merge pull request #12 from afabiani/master

 - statically registering JAI Operations
Merge pull request #13 from afabiani/master

 - better transaction handling
Merge pull request #14 from afabiani/master

 - fix transaction handling
Merge pull request #15 from afabiani/master

 - Soil Sealing Imperviousness Middleware process
Merge pull request #16 from afabiani/master

 - finalizing Soil Sealing Imperviousness Process
Merge pull request #17 from afabiani/master

 - soil computation fixes
Modifications on the ChangeMatrix and Middleware processes
Merge pull request #18 from n-lagomarsini/indexes

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

Modifications on the SoilSealingImperviousnessProcess coefficient
Added color to indexes 3/4
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