Licensing changes: Added GPLv3 licence
Removed not needed comments
Simplified some javascript constructions
Added  initial data to DamageReportsExport
Removed unwanted V after DamageReportsExport class name
Optimized DamageReportsExport database query
damage_reports_export_to_csv now returns string instead of rising error when no data is available
Merge branch 'release-0.1' into develop